As you're developers gollum may work well: it's backed by a git repo so you can edit locally and/or on a shared server.

Gollum is what powers GitHub wikis.

This definitely seems promising for what I'm looking for. Thanks!

What size and what lifetime?

If you want something that is about 2-5 pages long and is only actively updated for 3 weeks then archived, Dropbox Paper works well for the 8 months my team has been using it.

Size would be fairly small, but the lifetime would be at least 8 months. Thanks for the suggestion!

Workflowy seems nice.

https://workflowy.com/demo/embed/

That's really neat! Thanks for sharing!

Mediawiki, dokuwiki, meemo

I hadn't heard of meemo before. Thanks!