[boost] [website][unordered] Patches on release notes.

Hi, There's a fairly serious bug in Boost.Unordered in 1.50 so I wanted to make a patch available. I've added it to the release notes, at the top so it's quite visible, you can see it here: http://www.boost.org/users/history/version_1_50_0.html I'm emailing about this, partly to bring the patch to people's attention and partly to find out what you think of using the release notes this way. Daniel