Add a note about dart-lang#767

it’s closed

Author: kevmoo

test/model_test.dart

@@ -396,6 +396,7 @@ void main() {
         expect(docsAsHtml,
             contains('<a href="">css.theOnlyThingInTheLibrary</a>'));
       },
+          //(TODO:???) https://github.com/dart-lang/dartdoc/issues/767 is closed
           skip:
               'Wait for https://github.com/dart-lang/dartdoc/issues/767 to be fixed');