This cleanup patch updates the developer documentation with respect to the migration to the git scm. (cherry picked from commit 87800dc2bf8f2724a99e51bb079ad7fb4b9dfd3b)
Originally committed as revision 5942 to svn://svn.ffmpeg.org/ffmpeg/trunk
Originally committed as revision 5941 to svn://svn.ffmpeg.org/ffmpeg/trunk