Update NFS docs to reflect new Rugged backports
Update NFS docs to reflect new Rugged backports

We backported the Rugged implementations of a Git access to older
versions of GitLab. Update the documentation to reflect this.

Relates to:

* https://gitlab.com/gitlab-com/www-gitlab-com/merge_requests/21833/diffs
* https://gitlab.com/gitlab-org/release/tasks/issues/749

iiet/iiet-git,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq