Collab

Because knowledge is like kit kat - it's better shared.

Git/Github

Git and github, while traditionally used for collaborating on code, works out great for notes as well.

Git

use git blame to see line level authorship of all your notes
use the git feature branch workflow to have multiple people working on separate parts of the knowledge base at the same time

Github

use pull requests to contribute and collection contributions for your notes
use the wiki to have meta discussions about notes
use issues to request changes
use github projects to share publishing roadmap

VSCode provides a live share extension that let you do google doc style like collab. You can the extension and read the docs about it here.