If you are only after generating an interactive API document (without the need for wiki style collaboration), I/O Docs would be a better solution requires much less effort to set up, use and customise, IMHO.
It's running on nodejs and Redis. You only need to write a JSON schema of your API and it generates a HTML/JS site that describes your API and lets developers to play with it live from their browser.
I plan to host my API on my server (as requiring anyone to install 2 other softwares just to view the API would be crazy) but the JSON schema itself already has a nice readable and compact structure which I think would be sufficient for collaboration with other programmers. It's a small project.
There is a similar question you may want to check out.
