I'm like the motherfuckin' scan man! why do I have this crap?
These are instructions from Pete at SOTMC. basically, you just jack up the bike, let the airpressure out of the forks, pull off the caps and shorten the spacer in each tube. You can also use 1" PVC pipe instead of the spacers -but I found its just a few mm too thick to fit in the tube so you have to sand the diameter down just a little. I don't have air pressurized forks, but I understand that the proceedure is the same regardless. I know amazngrace and m@man both have air forks and lowered them if you want to double check.
If it hasn't been changed recently, its also a good time to change out the fork oil. THen its up to you whether to put air back in or not. I know a lot of people who don't bother.