adding a clarifying comment to ora

playbooks/roles/ora/vars/main.yml

@@ -10,6 +10,11 @@ ora_gunicorn_workers: 4
 ora_nginx_port: 18091
 ora_gunicorn_port: 8091
 
+# ora_env_config and ora_auth_config
+# should be overridden for your
+# environment.  The defaults are
+# appropriate for running all edX
+# services on a single server.
 ora_env_config:
   "LOGGING_ENV": "prod-grader"
   "LOG_DIR": "/mnt/logs"