update gunicorn config in docs

Raymond Barbiero · Olivier Gambier · commit cf7a6a5c3a94 · 2014-10-02T11:55:10.000-07:00
diff --git a/ADVANCED.md b/ADVANCED.md
@@ -154,7 +154,7 @@ docker-registry
 If you want greater control over gunicorn:
 
 ```
-gunicorn -c contrib/gunicorn.py docker_registry.wsgi:application
+gunicorn -c contrib/gunicorn_config.py docker_registry.wsgi:application
 ```
 
 or even bare
