RGL browser: remove duplicates in API tab

For some reason I was scanning both Syntax and
Constructors, Cat, Structural, Combinators
even though the former imports all the latter...

doc/browse/script.js

@@ -354,7 +354,7 @@ function Thing() {
     this.apiModules = [
         // api
         "Syntax",
-        "Constructors", "Cat", "Structural", "Combinators",
+        // "Constructors", "Cat", "Structural", "Combinators",
         // abstract
         // "Adjective",
         // "Adverb",