Update google-login.md

adding an important reference to the release keys that was only visible in the "initial setup" document

Author: dprado75

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

@@ -158,4 +158,8 @@ allowFullScreen style={{ width: '100%', height: '600px' }}></iframe>
 To confirm the successful integration of Google authentication and the creation of users, navigate
 to your **Firebase project > Authentication > Users** and check the entries.
 
-![verify-google-auth-users.png](../imgs/verify-google-auth-users.png)
+![verify-google-auth-users.png](../imgs/verify-google-auth-users.png)
+
+:::info
+To ensure that your Android release will authenticate to Google, make sure to use Google Play Console's SHA keys - see how to [Getting *SHA* keys for release mode](initial-setup.md/#getting-sha-keys-for-release-mode).
+:::