examples: rename ui events and increase priority (#2840)

### Change Type

- [x] `internal` — Any other changes that don't affect the published
package[^2]

apps/examples/src/examples/ui-events/README.md

@@ -1,8 +1,8 @@
 ---
-title: UI events
+title: Code X-Ray for UI events
 component: ./UiEventsExample.tsx
 category: editor-api
-priority: 2
+priority: 0
 ---
 
 Listen to events from tldraw's UI.