docs(devguide): fix invalid JavaScript syntax in hero-form.component.js example (#2343)

Fix Unmatched '{' JavaScript syntax error in hero-form.component.js example

Author: pixelchutes

Diff for: public/docs/_examples/forms/js/app/hero-form.component.js

@@ -48,5 +48,5 @@
 
       // #docregion first, final
     });
-  // #enddocregion first, final
 })(window.app || (window.app = {}));
+// #enddocregion first, final