The spec file of libcanberra contains the following line: %doc %{_datadir}/gtk-doc This is bad, because this folder and the subfolder "html" (which is also owned by your package this way) is already owned by the gtk-doc package. Please change the line as follows: %doc %{_datadir}/gtk-doc/html/* and add gtk-doc as a runtime requirement to the -devel package.
Sorry for the blurb, just found the appropriate paragraph in the guidelines: http://fedoraproject.org/wiki/Packaging:Guidelines#The_directory_is_owned_by_a_package_which_is_not_required_for_your_package_to_function