There's no need to depend on gtk-doc to install .html files. See the tracking bug for details.
Still present on F15. See the revised guidelines which mention specifically gtk-doc: http://fedoraproject.org/wiki/PackagingGuidelines#File_and_Directory_Ownership
Fix committed to Rawhide git. Not build yet, however.
Still an issue on F16.
see comment 2 - meanwhile it has been built for Rawhide