/usr/share/doc/libmagickwand-6.q16-dev/changelog.Debian.gz is in libmagickwand-6.q16-dev 8:6.8.9.9-7ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmagickwand-6.q16-dev/../libmagickcore-6.q16-2/changelog.Debian.gz