For documentation, knowledge of LaTeX is a plus, as I am thinking of preparing them in LaTeX format, which is human readable and easy to import to SVN.
The changes you wish to make may range from improving clarity of the text,
to doing major writing/re-structuring of the documentation. Any and all improvements
are gladly received.
The FireBoard Documentation Project, like anything else in the FireBoard project, can
always use assistance! If you’re interested in contributing to the Documentation
Project, you can join the 17+ interested members so far
If you don't know LaTeX, I would recommend to start using
LyX.