Remove unnecessary python code-block

Author: Steve Pulec

docs/scenarios/admin.rst

@@ -20,7 +20,7 @@ latter will ssh into each server, cd to our project directory, activate the
 virtual environment, pull the newest codebase, and restart the application
 server.
 
-.. code-block:: python
+::
 
     from fabric.api import cd, env, prefix, run, task