Gitwash

Je ne comprends pas - these are links to the git documentation, which looks like it is mirrored in both ``kernel.org`` and ``schacon.github.io``.

The commit which implemented this was https://github.com/matthew-brett/gitwash/commit/4904992ab375456cade9b46470ccb8b0ef05e4af and comically, I believe I found some dead links and raised a gitwash issue, which was fixed and which mentioned my name.