websocket: `worldId` removed and `travelingToLocation` added in type: `user-location`

[C0D3-M4513R]

I just observed, that the Websocket documentation is wrong for the user-location type.
The worldId was removed and travelingToLocation was added.
This is probably just a rename of that attribute, but the change should be documented regardless.

[jellejurre]

Closed by vrchatapi/vrchatapi.github.io#150