Here you'll soon find a description for the proceedure of become a contributor to the Jetspeed 2 Website and how to contribute good documentation on that website.
"The J2 Website generation process works off the xdocs directories in each of the subprojects with the main site being located in the /xdocs directory. I suggest starting a section in the WIKI on how to write docs and how to contribute to the docs project." - David Le Strat