Update UBL comments for debug change

Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp

@@ -127,9 +127,6 @@
    *   J #   Grid       Perform a Grid Based Leveling of the current Mesh using a grid with n points on a side.
    *                    Not specifying a grid size will invoke the 3-Point leveling function.
    *
-   *   K #   Kompare    Kompare current Mesh with stored Mesh # replacing current Mesh with the result. This
-   *                    command literally performs a diff between two Meshes.
-   *
    *   L     Load       Load Mesh from the previously activated location in the EEPROM.
    *
    *   L #   Load       Load Mesh from the specified location in the EEPROM. Set this location as activated
@@ -265,12 +262,20 @@
    *
    *   V #   Verbosity  Set the verbosity level (0-4) for extra details. (Default 0)
    *
-   *   W     What?      Display valuable Unified Bed Leveling System data.
-   *
    *   X #              X Location for this command
    *
    *   Y #              Y Location for this command
    *
+   * With UBL_DEVEL_DEBUGGING:
+   *
+   *   K #  Kompare     Kompare current Mesh with stored Mesh #, replacing current Mesh with the result.
+   *                    This command literally performs a diff between two Meshes.
+   *
+   *   Q-1  Dump EEPROM Dump the UBL contents stored in EEPROM as HEX format. Useful for developers to help
+   *                    verify correct operation of the UBL.
+   *
+   *   W    What?       Display valuable UBL data.
+   *
    *
    *   Release Notes:
    *   You MUST do M502, M500 to initialize the storage. Failure to do this will cause all