Fix Js.Dict2 mentioned in Js.Dict documentation

[wingyplus]

The document is section for Js.Dict module but it's mentioned Js.Dict2
in function set section.

[ryyppy]

I need to verify, but it might be that most of the parameter lists of each Js.Dict function are wrong then.

Js.Dict2 has the major difference that the dict value goes in the first parameter position. In Js.Dict it's the last position (legacy pipe-last api).

[wingyplus]

@ryyppy I'm not sure that Js.Dict2 is simply to Js.Dict or it's a new module for ReScript. But I can make sure that Js.Dict is accepted Js.Dict.t as a first parameter like example below:

let () = {
  let dict = Js.Dict.empty()
  Js.Dict.set(dict, "hello", "world")
  Js.log(dict)
}

[ryyppy]

Just noticed that Js.Dict2 is actually not a thing. Thanks for your patience!