/usr/share/man/man5/fireqos-class4.5.gz is in fireqos-doc 2.0.3+ds-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man5/fireqos-class.5.gz
/usr/share/man/man5/fireqos-class.5.gz