/usr/share/doc/libgig-dev/changelog.Debian.gz is in libgig-dev 4.1.0~repack-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgig-dev/../libgig8/changelog.Debian.gz
/usr/share/doc/libgig-dev/../libgig8/changelog.Debian.gz