[PATCH] Writing udev rules docs update

Here's a long overdue update to the udev rules docs, based on lots of user
feedback from the last few months.

Mostly updates to keep up with the new udev features, some clarifications and
wording improvements. I added a section on rules for palm pilots due to the
excessive amount of mail I get about them. I removed the nvidia stuff because
it's out of date. Added another section about debugging using logs and
udevtest. Removed the thanks list because I haven't been updating it and there
are too many people to name now, sorry..!