/usr/share/doc/libtntnet-dev/AUTHORS is in libtntnet-dev 2.2.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libtntnet-dev/../libtntnet12v5/AUTHORS
/usr/share/doc/libtntnet-dev/../libtntnet12v5/AUTHORS