clean up formatting

Signed-off-by: Paul Schultz <pschultz@pobox.com>

docs/tutorials/react-router-stable-migration.md

@@ -181,10 +181,14 @@ It's crucial that you update to `RequirePermission` at the same time as you upda
 When migrating over to React Router v6 stable, you might also see browser console warnings for the `Navigate` component. This will need to be wrapped up in a `Route` component with the `Navigate` component in the `element` prop.
 
 ```tsx
-{/* highlight-remove-next-line */}
-<Navigate key="/" to="catalog" />
-{/* highlight-add-next-line */}
-<Route path="/" element={<Navigate to="catalog" />} />
+{
+  /* highlight-remove-next-line */
+}
+<Navigate key="/" to="catalog" />;
+{
+  /* highlight-add-next-line */
+}
+<Route path="/" element={<Navigate to="catalog" />} />;
 ```
 
 ### `NavLink`