updated the op in line with some comments

I agree that what I wrote regarding WHM's depth was misleading. So I altered its wording to "White mage is a job, it is not be a conjurer with larger heals. It must have more complexity."

also added some descriptors of the others...not like the devs are going to listen if 5.4's patch of "We want you to use aetherflow stacks on healing" is any indication :/