Remove reference to ClassicGPSDProtocol

git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/positioning-3926-2@37801 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb
Documentation is good

git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/positioning-3926-2@37816 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb