fix(docs): Remove trailing whitespace

Otherwise, prettier fails.

docs/docs/development/new-shield.md

@@ -55,7 +55,7 @@ config SHIELD_MY_BOARD
 	def_bool $(shields_list_contains,my_board)
 ```
 
-This will make sure that a new configuration value named `SHIELD_MY_BOARD` is set to true whenever `my_board` is used as the shield name, either as the `SHIELD` variable [in a local build](build-flash.md) or in your `build.yaml` file [when using Github Actions](../customization). Note that this configuration value will be used in `Kconfig.defconfig` to set other properties about your shield, so make sure that they match. 
+This will make sure that a new configuration value named `SHIELD_MY_BOARD` is set to true whenever `my_board` is used as the shield name, either as the `SHIELD` variable [in a local build](build-flash.md) or in your `build.yaml` file [when using Github Actions](../customization). Note that this configuration value will be used in `Kconfig.defconfig` to set other properties about your shield, so make sure that they match.
 
 **For split boards**, you will need to add configurations for the left and right sides. For example, if your split halves are named `my_board_left` and `my_board_right`, it would look like this: