Update Option.v's Parameters to Definition
This a clone of https://gitlab.com/nomadic-labs/coq-tezos-of-ocaml/-/merge_requests/344
The first one was opened from the fork which didn't trigger the CI.
The additional stuff apart from https://gitlab.com/nomadic-labs/coq-tezos-of-ocaml/-/merge_requests/344 is the follow up to the edits mentioned in https://gitlab.com/nomadic-labs/coq-tezos-of-ocaml/-/merge_requests/344 by @clarus1.