Any chance of switching to Tiki Wiki for D7 documentation? It would be a much better platform to use for this. If you give us a more robust platform like this for documentation editing, I would be much more likely to contribute my time. Your documentation will be as good as the tools you have to work with. I really think Dolphins technical documentation needs to be taken to the next level, with ample screen shots and tutorial videos. There are some pretty well known names on the list of Tiki-Wiki see more users, and for good reason..... it's the best. Please give the Tiki-Wiki platform some serious thought.
If I were Boonex however, I'd be careful who to let edit documentation. You do not want to make it a free-for-all and turn it into a chaotic mess. A comprehensive content outline should be created first which will initially contain many blank pages. Unity members/editors could then easily see what is needed, and pick a page to edit that they feel most confident in providing content. Dolphin 7 was years in the making, and without a serious joint effort, comprehensive documentation will also be years in the making. Give us a platform that's fun to work with, and I think you'll see a lot of members here rise to the occasion and pitch in their time. I know I would.
Why don't you use to write or edit articles in current wiki?