Cleanup of old includes, add comments

Marlin/Configuration_adv.h

   // probing on a screwhead or hollow washer, probe near the edges.
   //#define CALIBRATION_MEASURE_AT_TOP_EDGES
 
-  // Define pin which is read during calibration
+  // Define the pin to read during calibration
   #ifndef CALIBRATION_PIN
     #define CALIBRATION_PIN -1 // Override in pins.h or set to -1 to use your Z endstop
     #define CALIBRATION_PIN_INVERTING false // Set to true to invert the pin

Marlin/src/gcode/lcd/M0_M1.cpp

  *
  */
 
-#include "../../inc/MarlinConfig.h"
+#include "../../inc/MarlinConfigPre.h"
 
 #if HAS_RESUME_CONTINUE
 
 #include "../gcode.h"
-#include "../../module/stepper.h"
+#include "../../module/planner.h"
+
+#include "../../inc/MarlinConfig.h"
 
 #if HAS_LCD_MENU
   #include "../../lcd/ultralcd.h"
   #include "../../lcd/extensible_ui/ui_api.h"
 #endif
 
-#include "../../sd/cardreader.h"
-
 #if HAS_LEDS_OFF_FLAG
   #include "../../feature/leds/printer_event_leds.h"
 #endif

Marlin/src/pins/rambo/pins_EINSY_RETRO.h

   #error "You must set ([XYZ]|E0)_DRIVER_TYPE to TMC2130 in Configuration.h for EinsyRetro."
 #endif
 
-// TMC2130 Diag Pins (currently just for reference)
+// TMC2130 Diag Pins
 #define X_DIAG_PIN         64
 #define Y_DIAG_PIN         69
 #define Z_DIAG_PIN         68
 
 #if DISABLED(SENSORLESS_HOMING)
 
-  #define X_MIN_PIN        12
-  #define Y_MIN_PIN        11
-  #define Z_MIN_PIN        10
-  #define X_MAX_PIN        81
-  #define Y_MAX_PIN        57
+  #define X_MIN_PIN        12   // X-
+  #define Y_MIN_PIN        11   // Y-
+  #define Z_MIN_PIN        10   // Z-
+  #define X_MAX_PIN        81   // X+
+  #define Y_MAX_PIN        57   // Y+
 
 #else
 
   #if X_HOME_DIR < 0
     #define X_MIN_PIN      X_DIAG_PIN
-    #define X_MAX_PIN      81
+    #define X_MAX_PIN      81   // X+
   #else
-    #define X_MIN_PIN      12
+    #define X_MIN_PIN      12   // X-
     #define X_MAX_PIN      X_DIAG_PIN
   #endif
 
   #if Y_HOME_DIR < 0
     #define Y_MIN_PIN      Y_DIAG_PIN
-    #define Y_MAX_PIN      57
+    #define Y_MAX_PIN      57   // Y+
   #else
-    #define Y_MIN_PIN      11
+    #define Y_MIN_PIN      11   // Y-
     #define Y_MAX_PIN      Y_DIAG_PIN
   #endif