✏️ Fix NOZZLE_PARK_Y_ONLY sanity-check (#23990)

Marlin/src/inc/SanityCheck.h

 #elif defined(NOZZLE_PARK_X_ONLY)
   #error "NOZZLE_PARK_X_ONLY is now NOZZLE_PARK_MOVE 1."
 #elif defined(NOZZLE_PARK_Y_ONLY)
-  #error "NOZZLE_PARK_X_ONLY is now NOZZLE_PARK_MOVE 2."
+  #error "NOZZLE_PARK_Y_ONLY is now NOZZLE_PARK_MOVE 2."
 #elif defined(Z_STEPPER_ALIGN_KNOWN_STEPPER_POSITIONS)
   #error "Z_STEPPER_ALIGN_KNOWN_STEPPER_POSITIONS is now just Z_STEPPER_ALIGN_STEPPER_XY."
 #elif defined(DWIN_CREALITY_LCD_ENHANCED)