Merge basic-docs-format-6947-2: basics.rst should be properly formatted

Author: hawkowl
Reviewers: hynek, adiroiban
Fixes: #6947

git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/trunk@43082 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb