Actually, it's in there already, under What if I wanna talk to someone in private?:

...If you're trying to talk to someone who has a space in their name, you'll have to use an underscore (_) instead of the space in their name.

His Royal Cheeziness

In reply to Re: Document use of underscore in Chatterbox by CheeseLord
in thread Document use of underscore in Chatterbox by bikeNomad

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