Sanity check for the renamed options

Marlin/SanityCheck.h

@@ -153,6 +153,8 @@
   #error "LCD_PIN_BL is now LCD_BACKLIGHT_PIN. Please update your pins definitions."
 #elif defined(LCD_PIN_RESET)
   #error "LCD_PIN_RESET is now LCD_RESET_PIN. Please update your pins definitions."
+#elif defined(EXTRUDER_0_AUTO_FAN_PIN) || defined(EXTRUDER_1_AUTO_FAN_PIN) || defined(EXTRUDER_2_AUTO_FAN_PIN) || defined(EXTRUDER_3_AUTO_FAN_PIN)
+  #error "EXTRUDER_[0123]_AUTO_FAN_PIN is now E[0123]_AUTO_FAN_PIN. Please update your Configuration_adv.h."
 #endif
 
 /**