/usr/share/doc/libimage-magick-q16hdri-perl/changelog.Debian.gz is in libimage-magick-q16hdri-perl 8:6.9.7.4+dfsg-16ubuntu6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libimage-magick-q16hdri-perl/../libmagickcore-6.q16hdri-3/changelog.Debian.gz