Remove now-redundant explicit "elasticsearch" command

Closes #228

elasticsearch/content.md

@@ -19,7 +19,7 @@ $ docker run -d elasticsearch
 You can also pass in additional flags to `elasticsearch`:
 
 ```console
-$ docker run -d elasticsearch elasticsearch -Des.node.name="TestNode"
+$ docker run -d elasticsearch -Des.node.name="TestNode"
 ```
 
 This image comes with a default set of configuration files for `elasticsearch`, but if you want to provide your own set of configuration files, you can do so via a volume mounted at `/usr/share/elasticsearch/config`: