/usr/share/doc/libmarkdown2-dev/changelog.Debian.gz is in libmarkdown2-dev 2.2.3b8-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmarkdown2-dev/../libmarkdown2/changelog.Debian.gz
/usr/share/doc/libmarkdown2-dev/../libmarkdown2/changelog.Debian.gz