(doc) update API spec to include user subscription routes
(doc) update API spec to include user subscription routes

Chocobozzz/PeerTube,Green-Star/PeerTube,Chocobozzz/PeerTube,Green-Star/PeerTube,Green-Star/PeerTube,Green-Star/PeerTube,Chocobozzz/PeerTube,Chocobozzz/PeerTube