Clean up trailing whitespace

Marlin/Configuration_adv.h

@@ -1949,14 +1949,14 @@
  * Specify an action command to send to the host on pause and resume.
  * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
  * The host must be configured to handle the action command.
- * 
+ *
  *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
  *                    action while Marlin continues to process G-Code. (M24/M25)
- * 
+ *
  * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
  *                    change actions and the host needs to stop sending commands
  *                    until the machine is ready to resume. (M125/M600)
- * 
+ *
  *           CANCEL : Instructs the host to abort the print job. Used when the
  *                    print is canceled from the LCD menu.
  */