Update gitaly docs to enumerate how to eliminate NFS altogether
Update gitaly docs to enumerate how to eliminate NFS altogether

mmkassem/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq