There's no need to depend on gtk-doc to install .html files. See the tracking bug for details.
Yet there is a need to depend on gtk-doc for directory ownership anyway. Won't fix until fedora-packaging is persuaded.
Still present on F15. See the revised guidelines which mention specifically gtk-doc: http://fedoraproject.org/wiki/PackagingGuidelines#File_and_Directory_Ownership
Looks like this package has been dropped.