doc: update link to MDN page about dynamic imports
This was split into a separate page 2 days ago: https://github.com/mdn/content/commit/d2b50123d485c68c5321339446cf77a4bb16dd82
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This was split into a separate page 2 days ago: https://github.com/mdn/content/commit/d2b50123d485c68c5321339446cf77a4bb16dd82