I fat-fingered my XCode Doc Set in two ways:
entered the wrong password/name, and it doesn’t prompt for a new one (I’ll solve this in a little time)
accidentally hit “Hide Doc Set” when I right clicked it, trying to figure out how to reset the name / password to try to subscribe.
where’d it go?!
At the bottom-left of the listing of doc sets is a button that brings up a menu with the option you’re looking for.