Added the URL for pro users

Author: pinkeshmars

docs/ff-integrations/authentication/firebase-auth/google-login.md

@@ -63,8 +63,7 @@ To let users log out of your app, you can use the [**Logout**](../logout-action.
    domain in the Firebase console and Google cloud console.
 
     - **For Test mode**, you can open the browser console, try logging in, and
-      get the domain from the browser console. It should look like '
-      ff-debug-service-frontend-ygxkweukma-uc.a.run.app'.
+      get the domain from the browser console. It should look like 'ff-debug-service-frontend-ygxkweukma-uc.a.run.app'. For *Pro* users, the URL will include "-pro" in the middle, such as 'ff-debug-service-frontend-**pro**-ygxkweukma-uc.a.run.app'.
 
     - **For Run mode**, you can simply use 'app.flutterflow.io'.