[A11y] Change role attribute of Recaptcha iframe (#9306)

* changed recaptcha role

* Changed role to document

Author: advay26

src/NuGetGallery/App_Code/ViewHelpers.cshtml

@@ -661,6 +661,7 @@ var hlp = new AccordionHelper(name, formModelStatePrefix, expanded, page);
 
             window.onload = function () {
                 $('div.g-recaptcha iframe').attr({ tabindex: "1" });
+                $('div.g-recaptcha iframe').attr({ role: "document" });
             }
         </script>
     }