LibWeb: Add missing spec link for ImageData constructor

Author: https://github.com/kennethmyhra
Commit: 40d62a4365
Pull-request: https://github.com/SerenityOS/serenity/pull/23727
Reviewed-by: https://github.com/Lubrsi

Userland/Libraries/LibWeb/HTML/ImageData.cpp

@@ -17,6 +17,7 @@ namespace Web::HTML {
 
 JS_DEFINE_ALLOCATOR(ImageData);
 
+// https://html.spec.whatwg.org/multipage/canvas.html#dom-imagedata
 WebIDL::ExceptionOr<JS::NonnullGCPtr<ImageData>> ImageData::create(JS::Realm& realm, u32 sw, u32 sh, Optional<ImageDataSettings> const&)
 {
     auto& vm = realm.vm();