General cleanup of spacing, comments

Marlin/Marlin.h

 extern int flow_percentage[EXTRUDERS]; // Extrusion factor for each extruder
 extern float filament_size[EXTRUDERS]; // cross-sectional area of filament (in millimeters), typically around 1.75 or 2.85, 0 disables the volumetric calculations for the extruder.
 extern float volumetric_multiplier[EXTRUDERS]; // reciprocal of cross-sectional area of filament (in square millimeters), stored this way to reduce computational burden in planner
-extern bool axis_known_position[XYZ]; // axis[n].is_known
-extern bool axis_homed[XYZ]; // axis[n].is_homed
+extern bool axis_known_position[XYZ];
+extern bool axis_homed[XYZ];
 extern volatile bool wait_for_heatup;
 
 #if HAS_RESUME_CONTINUE

Marlin/Marlin_main.cpp

 #if HAS_PROBING_PROCEDURE || HOTENDS > 1 || ENABLED(Z_PROBE_ALLEN_KEY) || ENABLED(Z_PROBE_SLED) || ENABLED(NOZZLE_CLEAN_FEATURE) || ENABLED(NOZZLE_PARK_FEATURE) || ENABLED(DELTA_AUTO_CALIBRATION)
 
   bool axis_unhomed_error(const bool x/*=true*/, const bool y/*=true*/, const bool z/*=true*/) {
-#if ENABLED(HOME_AFTER_DEACTIVATE)
-    const bool xx = x && !axis_known_position[X_AXIS],
-               yy = y && !axis_known_position[Y_AXIS],
-               zz = z && !axis_known_position[Z_AXIS];
-#else
-    const bool xx = x && !axis_homed[X_AXIS],
-               yy = y && !axis_homed[Y_AXIS],
-               zz = z && !axis_homed[Z_AXIS];
-#endif
+    #if ENABLED(HOME_AFTER_DEACTIVATE)
+      const bool xx = x && !axis_known_position[X_AXIS],
+                 yy = y && !axis_known_position[Y_AXIS],
+                 zz = z && !axis_known_position[Z_AXIS];
+    #else
+      const bool xx = x && !axis_homed[X_AXIS],
+                 yy = y && !axis_homed[Y_AXIS],
+                 zz = z && !axis_homed[Z_AXIS];
+    #endif
     if (xx || yy || zz) {
       SERIAL_ECHO_START;
       SERIAL_ECHOPGM(MSG_HOME " ");