/usr/share/doc/liblua5.2-rrd-dev/changelog.Debian.gz is in liblua5.2-rrd-dev 1.4.7-2ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/liblua5.2-rrd-dev/../librrd4/changelog.Debian.gz