configuration comment clarification

configuration-example.yaml

@@ -195,8 +195,8 @@ google_domain:
   # Should be an e-mail style name. E.g. "super-admin@example.com". The service
   # account credentials specified in the google_api.auth section are used to
   # perform admin actions as this user.
-  # If not using Domain-Wide Delegation (i.e. using an Admin Role with the
-  # service account as a member), use null.
+  # If not using Domain-Wide Delegation (i.e. the service account executing this
+  # script has been made a member of an Admin Role), use null or comment out.
   # Default: null
   admin_user: 'super-admin@example.com'