/usr/share/doc/libappstream-glib-dev/changelog.Debian.gz is in libappstream-glib-dev 0.7.7-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libappstream-glib-dev/../gir1.2-appstreamglib-1.0/changelog.Debian.gz