/usr/share/doc/libavahi-cil-dev/changelog.Debian.gz is in libavahi-cil-dev 0.6.19-4.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libavahi-cil-dev/../libavahi1.0-cil/changelog.Debian.gz