Fix comment on FILAMENT_RUNOUT_SENSOR

Marlin/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/Cartesio/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/Felix/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/Felix/DUAL/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/Hephestos/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/Hephestos_2/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/K8200/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/K8400/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/K8400/Dual-head/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/RigidBot/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/SCARA/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/TAZ4/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/WITBOX/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/adafruit/ST7565/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/delta/biv2.5/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/delta/generic/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/delta/kossel_mini/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/delta/kossel_pro/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/delta/kossel_xl/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/makibox/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)

Marlin/example_configurations/tvrrug/Round2/Configuration.h

 //========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
+                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)