fix instructions

apps/docs/src/pages/docs/migration/beta-v1.mdx

@@ -30,6 +30,7 @@ op.screenView({ title: 'Home' }); // path will be what ever window.location.path
 ## Script tag
 
 - New: `https://openpanel.dev/op1.js` should be used instead of `op.js` (note the filename)
+- Renamed: Tracking with attributes have changed. Use `data-track="my_event"` instead of `data-event="my_event"`
 
 ## @openpanel/nextjs