/usr/share/man/man1/ocamldoc.opt.1.gz is in ocaml-native-compilers 4.02.3-5ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/ocamldoc.1.gz
/usr/share/man/man1/ocamldoc.1.gz