[Xcb] documentation patches

Tue May 22 01:32:54 PDT 2012

Hi Jamey,

Quoting Jamey Sharp (2012-03-26 19:46:00)
> So: bravo on merging these patches! Let's just not stop there, eh?
Just FYI: It’s extremely unlikely that I have the time to get into the
appropriate mindset within the next two months or so. I added a reminder
to my calendar for the time afterwards and will get back to this.

In case anyone wants to help out in the meantime, feel free.

Best regards,
Michael