You can clone with
HTTPS or Subversion.
Jeff had this idea of adding 'edit' button on the top of the document page that would take the user to github repo for contributing to the docs.
We have it on the github page. It would be cool to have it on the actual wiki as well.
(Needs to link like:
This is a NuGetDocs issue. Opened NuGet/NuGetDocs#71 over there