Relay Protocol misses documentation for RelayFull packet

[xtexx]

What happened?

At the relay protocol v1 documentation, there are only 7 kinds of packets (Type = 0..6).

However, there is a kind of RelayFull packet defined in the code:
https://github.com/syncthing/syncthing/blob/47f48faed7331b7ba4ad3d6775d5cffacf8931b5/lib/relay/protocol/packets.go#L23