Refine README.md

Author: likema

README.md

@@ -2,13 +2,13 @@
 
 [gluster-web-interface](https://github.com/oss2016summer/gluster-web-interface) is Web UI to manage GlusterFS.
 
-## Pull the image
+## Pull the image to local
 
 ```bash
 docker pull like/gluster-web-interface
 ```
 
-## Run the instance
+## Run the instance to expose port 3000
 
 ```bash
 docker run -it -p 3000:3000 like/gluster-web-interface