Fix typo in 'Using Supervisor with Docker' example

Docker-DCO-1.1-Signed-off-by: Yasunori Mahata <mahata777@gmail.com> (github: mahata)

docs/sources/examples/using_supervisord.rst

@@ -112,7 +112,7 @@ Once we've got a built image we can launch a container from it.
 
 .. code-block:: bash
 
-    sudo docker run -p 22 -p 80 -t -i <yourname>/supervisor
+    sudo docker run -p 22 -p 80 -t -i <yourname>/supervisord
     2013-11-25 18:53:22,312 CRIT Supervisor running as root (no user in config file)
     2013-11-25 18:53:22,312 WARN Included extra file "/etc/supervisor/conf.d/supervisord.conf" during parsing
     2013-11-25 18:53:22,342 INFO supervisord started with pid 1