While I at first agreed that this should be a Git repo, it could in the end defeat the document's purpose. This document is meant to be seen and governed by everyone, not only those who know how to use Git.
FYI, GitHub now allows you to fork, edit, and make a pull request all from its online interface, without ever cloning on your computer. Each save is a commit, and submissions are pull requests. The feature hasn't been publicized widely, and there isn't real documentation for lay-people, but all the functionality is there.
