/usr/share/doc/linux-tools-4.4.0-71-lowlatency/changelog.Debian.gz is in linux-tools-4.4.0-71-lowlatency 4.4.0-71.92~14.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-tools-4.4.0-71-lowlatency/../linux-lts-xenial-tools-4.4.0-71/changelog.Debian.gz