you forgot Alexander Korotkov, who contributed jsonb_hash_ops opclass for GIN. Something like "Alexander Korotkov introduced an elegant jsonb_hash ops for GIN, which competes with MongoDB performance in contains operator".
Aexanders work should definitely be credited in the release notes, but please let's not mention MongoDB (or any other product for that matter) in the release notes - they are about the technology, not the advocacy. (That's for things like the press kit..)