/usr/share/doc/libstfl-dev/changelog.Debian.gz is in libstfl-dev 0.22-1.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libstfl-dev/../libstfl0/changelog.Debian.gz
/usr/share/doc/libstfl-dev/../libstfl0/changelog.Debian.gz