Originally this was meant to be a note to maintainers, telling them that
they could re-name the class or whatever they like.

But a comment like that is likely to become outdated.  If you want to
refactor something, you really need to do the legwork to make sure that
it's *not* exposed anywhere public, so let's not give the maintainer in
question the false sense of security when they can read this one
docstring which might not have been updated appropriately when it was
changed.

git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/desynchronize-2673-2@43422 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb