/usr/share/doc/libvirt-ocaml-dev/changelog.Debian.gz is in libvirt-ocaml-dev 0.6.1.0-2build4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libvirt-ocaml-dev/../libvirt-ocaml/changelog.Debian.gz