This is a long post. If you are TLDR;, please at least skim through this before complaining about the current doc transition :)
The FreeNAS project has published a User Guide for each major software version since version 8.0.1. The platform for making the documentation has been mediawiki, which allows for collaborative editing of the upcoming version. This makes it easy for anyone to contribute to the documentation as they only need to make a wiki account and mediawiki formatting is fairly quick to learn and well documented. However, this method has several disadvantages:
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For users who are interested in assisting with doc edits, instructions for getting started are at
https://github.com/freenas/freenas/blob/master/docs/userguide/README. Feel free to ping me if you need help getting started. If you have a simple change you would like to see committed you can also ping me through the forums, IRC channel, or doc mailing list and I can commit the edit for you.