doc: message.header duplication correction
The old version of the text here was slightly incorrect (probably how it used to work, so it's now it's slightly more vague, deferring the details to the section in which they're already fully described.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The old version of the text here was slightly incorrect (probably how it used to work, so it's now it's slightly more vague, deferring the details to the section in which they're already fully described.