Code review comment for lp:~mr-russ/bzr/add-doc-for-shared-ssh-server

I've push a new version that has the required cleanup of the formatting. I've not adjusted the wording too much for the main content as I think it's still hitting the mark.

after IRC discussion the contrib/bzr_ssh_path_limiter was not used as it's not installed by default and increases the difficulty level for getting this setup up and running.