changed description of notes

README.md

@@ -68,11 +68,12 @@ Delete all tags for all images (do you really want to do it?):
 garbage collection. So, make sure you run something like below 
 (or put them in your crontab):
 ```
-  docker stop registry:2
-  docker-compose -f [path_to_your_docker_compose_file] run \
+  cd [path-where-your-docker-compose.yml]
+  docker-compose stop registry
+  docker-compose run \
        registry bin/registry garbage-collect \
        /etc/docker/registry/config.yml
-  docker start registry:2
+  docker-compose up -d registry
 ```  
 or (if you are not using docker-compose):
 ```