/usr/share/doc/liblua50-dev/NEWS.Debian.gz is in liblua50-dev 5.0.3-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/liblua50-dev/../liblua50/NEWS.Debian.gz
/usr/share/doc/liblua50-dev/../liblua50/NEWS.Debian.gz