Update M524 description

Marlin/src/gcode/gcode.h

@@ -216,7 +216,7 @@
  * M502 - Revert to the default "factory settings". ** Does not write them to EEPROM! **
  * M503 - Print the current settings (in memory): "M503 S<verbose>". S0 specifies compact output.
  * M504 - Validate EEPROM contents. (Requires EEPROM_SETTINGS)
- * M524 - Abort the current SD print job (started with M24)
+ * M524 - Abort the current SD print job started with M24. (Requires SDSUPPORT)
  * M540 - Enable/disable SD card abort on endstop hit: "M540 S<state>". (Requires SD_ABORT_ON_ENDSTOP_HIT)
  * M569 - Enable stealthChop on an axis. (Requires at least one _DRIVER_TYPE to be TMC2130 or TMC2208)
  * M600 - Pause for filament change: "M600 X<pos> Y<pos> Z<raise> E<first_retract> L<later_retract>". (Requires ADVANCED_PAUSE_FEATURE)