Bring FLSUN config more up to date

Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration.h

   // and processor overload (too many expensive sqrt calls).
   #define DELTA_SEGMENTS_PER_SECOND 160
 
-  // NOTE NB all values for DELTA_* values MUST be floating point, so always have a decimal point in them
-
   // Center-to-center distance of the holes in the diagonal push rods.
   #define DELTA_DIAGONAL_ROD 218.0 // mm
 
   #define DELTA_PRINTABLE_RADIUS 90.0
 
   // Delta calibration menu
-  // uncomment to add three points calibration menu option.
   // See http://minow.blogspot.com/index.html#4918805519571907051
   #define DELTA_CALIBRATION_MENU
 
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
   #define Z_PROBE_ALLEN_KEY_DEPLOY_2_X 0.0
   #define Z_PROBE_ALLEN_KEY_DEPLOY_2_Y DELTA_PRINTABLE_RADIUS
   #define Z_PROBE_ALLEN_KEY_DEPLOY_2_Z 100.0
-  #define Z_PROBE_ALLEN_KEY_DEPLOY_2_FEEDRATE (XY_PROBE_SPEED/10)
+  #define Z_PROBE_ALLEN_KEY_DEPLOY_2_FEEDRATE (XY_PROBE_SPEED)/10
 
   #define Z_PROBE_ALLEN_KEY_DEPLOY_3_X Z_PROBE_ALLEN_KEY_DEPLOY_2_X * 0.75
   #define Z_PROBE_ALLEN_KEY_DEPLOY_3_Y Z_PROBE_ALLEN_KEY_DEPLOY_2_Y * 0.75
 // @section machine
 
 // Invert the stepper direction. Change (or reverse the motor connector) if an axis goes the wrong way.
-#define INVERT_X_DIR true // DELTA does not invert
+#define INVERT_X_DIR true
 #define INVERT_Y_DIR true
 #define INVERT_Z_DIR true
 
-// Enable this option for Toshiba steppers
+// Enable this option for Toshiba stepper drivers
 //#define CONFIG_STEPPERS_TOSHIBA
 
 // @section extruder
 #if ENABLED(AUTO_BED_LEVELING_LINEAR) || ENABLED(AUTO_BED_LEVELING_BILINEAR)
 
   // Set the number of grid points per dimension.
+  // Works best with 5 or more points in each dimension.
   #define GRID_MAX_POINTS_X 9
   #define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X
 
   //#define PROBE_Y_FIRST
 
   #if ENABLED(AUTO_BED_LEVELING_BILINEAR)
-
     //
     // Experimental Subdivision of the grid by Catmull-Rom method.
     // Synthesizes intermediate points to produce a more detailed mesh.