Added right vs left specific pin assignments for dip switch (#13074)

* Added right vs left specific pin assignments for dip switch

* Update feature_dip_switch.md

* Ran formatting tools

docs/ja/feature_dip_switch.md

@@ -14,6 +14,8 @@ DIP スイッチは、以下を `rules.mk` に追加することでサポート
 ```c
 // Connects each switch in the dip switch to the GPIO pin of the MCU
 #define DIP_SWITCH_PINS { B14, A15, A10, B9 }
+// For split keyboards, you can separately define the right side pins
+#define DIP_SWITCH_PINS_RIGHT { ... }
 ```
 
 あるいは