ocaml-meross: enable MDX on lib/meross.mli
Run mdx on lib/meross.mli so the {[ ... ]} odoc block now type-checks.
The example used unqualified `Protocol.http` (lives at
`Meross.Protocol.http`) and ran the live HTTP request to a smart plug
at the toplevel. Wrapped in `let run () = ...` and qualified the
Protocol path so the toploop resolves it through the `meross`
package.