Additional instructions for controller reverse options

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

@@ -875,6 +875,16 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 //#define ENCODER_STEPS_PER_MENU_ITEM 5
 
+/**
+ * Encoder Direction Options
+ *
+ * Test your encoder's behavior first with both options disabled.
+ *
+ *  Reversed Value Edit and Menu Nav? Enable REVERSE_ENCODER_DIRECTION.
+ *  Reversed Menu Navigation only?    Enable REVERSE_MENU_DIRECTION.
+ *  Reversed Value Editing only?      Enable BOTH options.
+ */
+
 //
 // This option reverses the encoder direction everywhere
 //