Can't we just moderate the wiki?
I imagined the Docs team would be responsible for its architecture and the moderation/approval of content which would simply be open for editing submissions by anyone. That keeps the structure from decaying into the problems Pete described and it allows immediate and easy editing submissions by anyone who drives by. If immediate-feedback is a concern, we could even have it configured so that recent yet-to-be-approved suggestions appear in some immediate form that marks them as obviously yet-to-be-approved or something.