Well you can just insert hyperlinks, but what you want is kind of an automatice redirect to a webpage?!
So for example, whenever you type the word "cleric" you want it to link to here:
http://paizo.com/pathfinderRPG/prd/c...es/cleric.html
hmm... could be handy to have a list such redirect somewhere. But even if the devs think the same way, it probably will be low on the list of priorities, seeing what they have on their plate right now.
But nice idea, can't hurt to add it to the backlog.