/usr/share/doc/libocamlnet-ocaml-dev/examples is in libocamlnet-ocaml-doc 3.7.3-3build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libocamlnet-ocaml-dev/../libocamlnet-ocaml-doc/examples