It sounds like you're describing something very similar to pairing (to write) and peer review on code, but for docs, rather than "meetings"?

You might wanna check out the twitter feed before jumping into their free hosting. Looks like they have had a lot of issues with connectivity/stability over the last few weeks at least.

https://twitter.com/gitlabstatus

We're seeing a lot of growth on GitLab.com. We just quadrupled the amount of instances running GitLab.com and are working hard on improving stability.