There's no need to depend on gtk-doc to install .html files. See the tracking bug for details.
Then what provides the /usr/share/gtk-doc/ directory ownership?
See the guideline:
Multiple packages own files in a common directory but none of them needs to require the others.
bash-completion owns the /etc/bash_completion.d directory and uses the files placed there to configure itself.
git places files into /etc/bash_completion.d
bzr places files into /etc/bash_completion.d
Solution: Both the git and bzr packages should own the /etc/bash_completion.d directory as bash-completion is optional functionality and the installation of git or bzr should not force the installation of bash-completion.
Rule of Thumb
When determining whether this exception applies, packagers and reviewers should ask this question: Do the files in this common directory enhance or add functionality to another package, where that other package is not necessary to be present for the primary functionality of this package?
So according to that documentation, all the packages own the directory.
However, in the tracker bug there doesn't seem to be consensus, so maybe the guideline needs to be updated.
Still present on F15.
See the revised guidelines which mention specifically gtk-doc:
Seems to be fixed already on F16.
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