Add odoc as a dependency to build documents
Add odoc as a dependency to build documents

Signed-off-by: Sora Morimoto <05d3fe3905f98ae89213fefee6827df133f2b2a1@morimoto.io>

c-cube/opam-repository,hannesm/opam-repository,mjambon/opam-repository,emillon/opam-repository,c-cube/opam-repository,mjambon/opam-repository,nberth/opam-repository,pirbo/opam-repository,djs55/opam-repository,ocaml/opam-repository,codinuum/opam-repository,pqwy/opam-repository,astrada/opam-repository,fpottier/opam-repository,Leonidas-from-XIV/opam-repository,Chris00/opam-repository,jhwoodyatt/opam-repository,pirbo/opam-repository,kkirstein/opam-repository,Chris00/opam-repository,pqwy/opam-repository,hannesm/opam-repository,andersfugmann/opam-repository,astrada/opam-repository,yallop/opam-repository,emillon/opam-repository,ocaml/opam-repository,toots/opam-repository,toots/opam-repository,nberth/opam-repository,yallop/opam-repository,codinuum/opam-repository,kkirstein/opam-repository,jhwoodyatt/opam-repository,Leonidas-from-XIV/opam-repository,djs55/opam-repository,fpottier/opam-repository,andersfugmann/opam-repository