[Docs] add qmk setup home parameter (qmk#11451)

docs/newbs_getting_started.md

@@ -168,6 +168,8 @@ Once that completes, re-run `qmk setup` to complete the setup and checks.
 
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+?> The qmk home folder can be specified at setup with `qmk setup -H <path>`, and modified afterwards using the [cli configuration](cli_configuration.md?id=single-key-example) and the variable `user.qmk_home`. For all available options run `qmk setup --help`.
+
 ?> If you already know [how to use GitHub](getting_started_github.md), we recommend that you create your own fork and use `qmk setup <github_username>/qmk_firmware` to clone your personal fork. If you don't know what that means you can safely ignore this message.
 
 ## 4. Test Your Build Environment