Fix up comments showing how to execute config migration. (qmk#11621)

Author: tzarc

keyboards/acheron/arctic/chconf.h

@@ -16,7 +16,7 @@
 
 /*
  * This file was auto-generated by:
- *    `qmk chibios-confupdate -i keyboards/acheron/arctic/chconf.h -r platforms/chibios/common/configs/chconf.h`
+ *    `qmk chibios-confmigrate -i keyboards/acheron/arctic/chconf.h -r platforms/chibios/common/configs/chconf.h`
  */
 
 #pragma once

keyboards/acheron/arctic/mcuconf.h

@@ -16,7 +16,7 @@
 
 /*
  * This file was auto-generated by:
- *    `qmk chibios-confupdate -i keyboards/acheron/arctic/mcuconf.h -r platforms/chibios/GENERIC_STM32_F072XB/configs/mcuconf.h`
+ *    `qmk chibios-confmigrate -i keyboards/acheron/arctic/mcuconf.h -r platforms/chibios/GENERIC_STM32_F072XB/configs/mcuconf.h`
  */
 
 #pragma once