Current text says

Auto (default): uses STUN and falls back to TURN if it's unable to establish a peer-to-peer connection
TURN: establishes a peer-to-peer connection
STUN: establishes a connection using an intermediary relay server

If TURN is a peer-to-peer connection, why would we fall back to it if "unable to establish a peer-to-peer connection"? Based on https://en.wikipedia.org/wiki/Traversal_Using_Relays_around_NAT ) think we want TURN to have the explanation "establishes a connection using an intermediary relay server".