GObject documentation fixes

[Adam Dingle <adam medovina org>]

A couple of weeks back I wrote a bunch of GObject documentation fixes 
and created a Bugzilla bug for them 
(http://bugzilla.gnome.org/show_bug.cgi?id=490637) and attached my 
changes as a patch.  The fixes address a couple of errors related to 
object construction and type macros, and also include dozens of 
spelling/grammar corrections.  I'm hoping these changes won't rot away 
in Bugzilla - is there some maintainer who might be able to commit these?

thanks!
adam