Note preset behaviour in `autocreate_auto_join_room_preset` docs #1090

Job	Run time
Calculate list of debian distros	9s
Build wheels on ubuntu-20.04 for x86_64	1m 43s
Build sdist	0s
Build .deb packages (debian:sid)	8m 16s
Attach assets to release	0s
	10m 8s

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