/usr/share/doc/libbatteries-ocaml-dev/html is in libbatteries-ocaml-doc 2.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libbatteries-ocaml-dev/../libbatteries-ocaml-doc/html
/usr/share/doc/libbatteries-ocaml-dev/../libbatteries-ocaml-doc/html