doc: remove unavailable youtube link in pull requests
This video(https://www.youtube.com/watch?v=HW0RPaJqm4g) isn't available anymore. And I couldn't find a proper github code review tutorial clip yet.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This video(https://www.youtube.com/watch?v=HW0RPaJqm4g) isn't available anymore. And I couldn't find a proper github code review tutorial clip yet.