Fix uncurried error

Author: fhammerschmidt

pages/docs/manual/latest/bind-to-js-function.mdx

@@ -444,7 +444,7 @@ type x
 @val external x: x = "x"
 @set external setOnload: (x, @this ((x, int) => unit)) => unit = "onload"
 @get external resp: x => int = "response"
-setOnload(x, @this ((o, v) => Js.log(resp(o) + v)))
+setOnload(x, @this (o, v) => Js.log(resp(o) + v))
 ```
 ```js
 x.onload = function (v) {