[boost] [iterator] What documentation is actual?

Hi, While moving next_prior.hpp to Boost.Iterator I've noticed that thete are basically two versions of the documentation in Boost.Iterator: rst and QuickBook. It seems like QuickBook is in progress of being written and is largely a conversion of rst, but is incomplete in some places. I'd like to ask what's the plan about it? Since I don't know rst I converted the original documentation of next_prior.hpp to QuickBook and added it to the current QuickBook docs. I also converted advance() and distance() docs to QuickBook and fixed a few problems in the docs so that it is at least browsable and readable. If we have no plans to switch to QuickBook then I suppose it is better to remove them to avoid confusion. Also, someone has to convert next_prior.hpp docs to rst (I don't know how to do this).