If someone tries to use the Usage example, a SyntaxError will be raised. Also, sphinx isn't able to build this docstring:
```
$ make -C docs clean html

...
                                                                                              
/home/semyers/ve/cfme-qe/cfme_tests/cfme/configure/access_control.py:docstring of cfme.configure.access_control.Users:3: ERROR: Unexpected indentation.
/home/semyers/ve/cfme-qe/cfme_tests/cfme/configure/access_control.py:docstring of cfme.configure.access_control.Users:9: WARNING: Block quote ends without a blank line; unexpected unindent.