message: docs(selfhosted): fix auth documentation
diff: @@ -28,9 +28,9 @@ Gitpod supports the following authentication providers:
  To authenticate your users with GitHub you need to create a [GitHub OAuth App](https://developer.github.com/apps/building-oauth-apps/creating-an-oauth-app/).
  Follow the guide linked above and:
  -- set "Authentication callback URL" to:
  +- set "Authentication callback URL" to after replacing example.com with your domain name:
  - https://<your-domain.com>/auth/github/callback
  + https://example.com/auth/github/callback
  - copy the following values and configure them in `values.yaml`:
  - `clientId`
  