Follow-up the PR #3719(Harmonize LCD comment section)

It update forgotten Configuration_DUAL.h.

Marlin/example_configurations/Felix/Configuration_DUAL.h

@@ -767,28 +767,28 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 //#define LCD_LANGUAGE en
 
-/**
- * LCD Character Set
- *
- * Note: This option is NOT applicable to Graphical Displays.
- *
- * All character-based LCD's provide ASCII plus one of these
- * language extensions:
- *
- *  - JAPANESE ... the most common
- *  - WESTERN  ... with more accented characters
- *  - CYRILLIC ... for the Russian language
- *
- * To determine the language extension installed on your controller:
- *
- *  - Compile and upload with LCD_LANGUAGE set to 'test'
- *  - Click the controller to view the LCD menu
- *  - The LCD will display Japanese, Western, or Cyrillic text
- *
- * See https://github.com/MarlinFirmware/Marlin/wiki/LCD-Language
- *
- * :['JAPANESE','WESTERN','CYRILLIC']
- */
+//
+// LCD Character Set
+//
+// Note: This option is NOT applicable to Graphical Displays.
+//
+// All character-based LCD's provide ASCII plus one of these
+// language extensions:
+//
+//  - JAPANESE ... the most common
+//  - WESTERN  ... with more accented characters
+//  - CYRILLIC ... for the Russian language
+//
+// To determine the language extension installed on your controller:
+//
+//  - Compile and upload with LCD_LANGUAGE set to 'test'
+//  - Click the controller to view the LCD menu
+//  - The LCD will display Japanese, Western, or Cyrillic text
+//
+// See https://github.com/MarlinFirmware/Marlin/wiki/LCD-Language
+//
+// :['JAPANESE','WESTERN','CYRILLIC']
+//
 #define DISPLAY_CHARSET_HD44780 JAPANESE
 
 //