Info for moderators

@explorerleslie , @cahrens , @gwprice , @srpearce , please take a look! HTML version here: http://draft-cohorts.readthedocs.org/en/latest/cohorts/cohorts_discussions.html
I think that once we implement the ability to edit the visibility of a post, we should change this behavior, but the documentation should of course describe the current behavior. I am ambivalent about emphasis on this point.