UX: Update setting description for oauth2_overrides_email (discourse#57)

Author: davidtaylorhq

config/locales/server.en.yml

@@ -22,7 +22,7 @@ en:
     oauth2_json_email_verified_path: "Path in the OAuth2 User JSON to the user's email verification state. eg: user.email.verified. oauth2_email_verified must be disabled for this setting to have any effect"
     oauth2_json_avatar_path: "Path in the Oauth2 User JSON to the user's avatar. eg: user.avatar_url"
     oauth2_email_verified: "Check this if the OAuth2 site has verified the email"
-    oauth2_overrides_email: "Override the Discourse email with the remote email on every login"
+    oauth2_overrides_email: "Override the Discourse email with the remote email on every login. Works the same as the `auth_overrides_email` setting, but is specific to OAuth2 logins."
     oauth2_send_auth_header: "Send client credentials in an HTTP Authorization header"
     oauth2_send_auth_body: "Send client credentials in the request body"
     oauth2_debug_auth: "Include rich debugging information in your logs"