Merge usage-docstring-formatting-7329

Fixes: #7329
Author: fbrennen
Reviewer: exarkun

Fix invalid epytext markup around the API documentation examples for
`twisted.python.usage.Options`.


git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/trunk@43485 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb