I have noticed that some of the AAs in the AAWindow have actual explanations of what each rank does, while others do not. example: Monk, class tab, Purify Body has what each rank will do for the character, while Improved Mend only has what the 1st rank will do for the character. It is possible to fill in the missing ones thru the different classes?
Can always go to raidloot.com and find out. But I agree that the in game descriptions leave a lot to be desired.