Update stale documentation links from the main documentation.
Update stale documentation links from the main documentation.

This could have been part of the 1.5.4 commit, but it isn't.

Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git