add diagram link

packages/excalidraw/element/cropElement.ts

@@ -207,6 +207,7 @@ const recomputeOrigin = (
   return newOrigin;
 };
 
+// refer to https://link.excalidraw.com/l/6rfy1007QOo/6stx5PmRn0k
 export const getUncroppedImageElement = (
   element: ExcalidrawImageElement,
   elementsMap: ElementsMap,