/usr/share/doc/liblua5.1-bitop-dev/changelog.Debian.gz is in liblua5.1-bitop-dev 1.0.2-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/liblua5.1-bitop-dev/../lua-bitop/changelog.Debian.gz