Course Content - deleting attached files

Interface change for the better: in Bb7, when you edited a content item to remove an attached file, clicking "Remove" automatically submits the page; in order to make other changes to the content item, you needed to edit the item again. Now in Bb9, when you edit a content item and remove an attached file, you click "mark for removal" instead. You can then make other changes to the content item, and click Submit to save all changes. This is an improvement.