docs: Minor touchups to studio related bits (#2707)

docs/docs/development/hardware-integration/new-shield.mdx

@@ -544,6 +544,7 @@ See [Hardware Metadata Files](hardware-metadata-files.md) for the full details.
 ## Testing
 
 Once you've defined everything as described above, you can build your firmware to make sure everything is working.
+If you wish to test that your keyboard works with [ZMK Studio](../../features/studio.md), you'll also need to follow the [instructions for enabling Studio](../../features/studio.md#building).
 
 ### GitHub Actions
 

docs/docs/features/studio.md

@@ -72,7 +72,8 @@ Building for ZMK Studio involves two main additional items.
 
 ### GitHub Actions
 
-First add a `studio-rpc-usb-uart` to the `snippet` property of your build configuration, in the `build.yaml` file at the root of your user config.
+Add a `studio-rpc-usb-uart` to the `snippet` property of your build configuration, in the `build.yaml` file at the root of your user config. Enabling the `ZMK_STUDIO` Kconfig setting can also be done from the `build.yaml` file using the `cmake-args` property.
+
 For a split keyboard, you should do this _only_ for your central/left side, e.g.:
 
 ```yaml title="build.yaml"
@@ -81,16 +82,11 @@ include:
   - board: nice_nano_v2
     shield: corne_left
     snippet: studio-rpc-usb-uart
+    cmake-args: -DCONFIG_ZMK_STUDIO=y
   - board: nice_nano_v2
     shield: corne_right
 ```
 
-Next, enable the `ZMK_STUDIO` Kconfig symbol, for example by adding the following line to your .conf file:
-
-```
-CONFIG_ZMK_STUDIO=y
-```
-
 ### Local Build
 
 When building locally, use the `-S` parameter to include the `studio-rpc-usb-uart` snippet. Instead of adding it to your config file, you can also append the `ZMK_STUDIO` Kconfig as an additional CMake argument, e.g.: