Man pages matching name morelabels.set.orderedtype in section 3o:

MoreLabels.Set.OrderedType.3o.en	debian 10 / ocaml-nox
MoreLabels.Set.OrderedType.3o.en	debian 11 / ocaml-man
MoreLabels.Set.OrderedType.3o.en	debian 12 / ocaml-man