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What does this mean in Vanilla in a simpler form
I guess you have to be more clear about the question. What are you trying to solve?
Under the Role Permissions, I saw this: http://prntscr.com/kqip98 where you are able to manage or not.
It grants more or less the same permissions as the Garden.Moderation.Manage permission. As far as I can see only the QnA plugin makes a difference. A user role with that permission should be able to mark any question as answered.