Fixed image upload demo (#1108)

docs/pages/docs/ui-components/image-toolbar.mdx

@@ -27,4 +27,4 @@ type uploadFile = (file: File) => Promise<string>;
 
 You can use the provided `uploadToTempFilesOrg` function to as a starting point, which uploads files to [tmpfiles.org](https://tmpfiles.org/). However, it's not recommended to use this in a production environment - you should use your own backend:
 
-<Example name="basic/minimal" />
+<Example name="backend/file-uploading" />