Add note about why `RoomID` is nulled in `DeepClone`
Add note about why `RoomID` is nulled in `DeepClone`

ppy/osu,NeoAdonis/osu,ppy/osu,NeoAdonis/osu,NeoAdonis/osu,ppy/osu,peppy/osu,peppy/osu,peppy/osu