/usr/share/man/man3/zzip_dirfd.3.gz is in libzzip-dev 0.13.62-3.1ubuntu0.18.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/zzip_dirhandle.3.gz
/usr/share/man/man3/zzip_dirhandle.3.gz