The FAQ is right in the sense that Fedora Project defines contributors as those with a Fedora account system and in one of the project groups but if you submit a patch via bugzilla, you are in no way bound by any other agreement other than the license under which you submit the patch and that's fine by Fedora because it doesn't require any kind of copyright assignment but merely clarity of licensing and any free software license fits the acceptance criteria. The only real point of the contributor agreement is to have a default license (MIT for code, CC-BY-SA for content) if a Fedora contributor submits something without a license.