Please be advised that MAVProxy now has a "homepage" and initial documentation effort.
If you can add to the documentation please do. If you find a mistake, please fix it. If you want to complain about how poor it is to start with, I'll listen to your complaints only after you've edited more on that subject that I have. :-)
I am not an author of mavproxy, but am doing this with the primary author's support, (Tridge)
It is located here: http://qgroundcontrol.org/mavlink/mavproxy_startpage