Updated documentation
Updated documentation

Added "Revoking Invitations" to the admin guide.

yacloud-io/teleport,tidalf/teleport,tidalf/teleport,tidalf/teleport,bshelton229/teleport,yacloud-io/teleport,tidalf/teleport,aashley/teleport,yacloud-io/teleport,gravitational/teleport,gravitational/teleport,yacloud-io/teleport,yacloud-io/teleport,ajvb/teleport,aashley/teleport,suedadam/teleport,bshelton229/teleport,gravitational/teleport,ajvb/teleport,suedadam/teleport,suedadam/teleport,aashley/teleport,ajvb/teleport,gravitational/teleport,bshelton229/teleport,ajvb/teleport,bshelton229/teleport,ajvb/teleport,yacloud-io/teleport,aashley/teleport,gravitational/teleport,sokoow/teleport,suedadam/teleport,bshelton229/teleport,aashley/teleport,sokoow/teleport,sokoow/teleport,tidalf/teleport,sokoow/teleport,suedadam/teleport,yacloud-io/teleport,gravitational/teleport,sokoow/teleport,sokoow/teleport