/usr/share/doc/libmysql-ocaml-dev/html/ is in libmysql-ocaml-dev 1.2.1-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libmysql-ocaml-dev/html/api/
/usr/share/doc/libmysql-ocaml-dev/html/api/Mysql.Prepared.html
/usr/share/doc/libmysql-ocaml-dev/html/api/Mysql.html
/usr/share/doc/libmysql-ocaml-dev/html/api/index.html
/usr/share/doc/libmysql-ocaml-dev/html/api/index_attributes.html
/usr/share/doc/libmysql-ocaml-dev/html/api/index_class_types.html
/usr/share/doc/libmysql-ocaml-dev/html/api/index_classes.html
/usr/share/doc/libmysql-ocaml-dev/html/api/index_exceptions.html
/usr/share/doc/libmysql-ocaml-dev/html/api/index_extensions.html
/usr/share/doc/libmysql-ocaml-dev/html/api/index_methods.html
/usr/share/doc/libmysql-ocaml-dev/html/api/index_module_types.html
/usr/share/doc/libmysql-ocaml-dev/html/api/index_modules.html
/usr/share/doc/libmysql-ocaml-dev/html/api/index_types.html
/usr/share/doc/libmysql-ocaml-dev/html/api/index_values.html
/usr/share/doc/libmysql-ocaml-dev/html/api/style.css
/usr/share/doc/libmysql-ocaml-dev/html/api/type_Mysql.Prepared.html
/usr/share/doc/libmysql-ocaml-dev/html/api/type_Mysql.html