Added description about Google Oauth2 setup

develop-docs/self-hosted/sso.mdx

@@ -32,6 +32,8 @@ Please refer to our [main SAML documentation](https://docs.sentry.io/accounts/ss
 
 As of [Sentry 9.1](https://github.com/getsentry/self-hosted/releases/tag/9.1.2), self-hosted Sentry comes with built-in Google Auth support. To enable, you'll need to [create a client ID and secret for your Google App](https://developers.google.com/identity/sign-in/web/server-side-flow#step_1_create_a_client_id_and_client_secret) and then enter these values into your [`sentry/config.yaml`](https://github.com/getsentry/self-hosted/blob/master/sentry/config.example.yml) file respectively:
 
+When configuring new Google credentials (https://console.cloud.google.com/apis/credentials) you must specify Authorized JavaScript origins: https://sentry.your.domain and Authorized redirect URIs: https://sentry.your.domain/extensions/google/setup and https://sentry.your.domain/auth/sso/
+
 ```yaml
 auth-google.client-id: '<client id>'
 auth-google.client-secret: '<client secret>'