/usr/share/doc/linux-tools-4.18.0-13-lowlatency/changelog.Debian.gz is in linux-tools-4.18.0-13-lowlatency 4.18.0-13.14~18.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-tools-4.18.0-13-lowlatency/../linux-hwe-tools-4.18.0-13/changelog.Debian.gz