Update OCaml-call-JS.adoc

Author: bobzhang

site/docsource/OCaml-call-JS.adoc

@@ -69,7 +69,7 @@ external imul : int -> int -> int = "c_imul" [@@bs.val "Math.imul"]
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-#### Binding to JavaScript constructor 
+#### Binding to JavaScript constructor: bs.new
 
 `bs.new` is used to create a JavaScript object.