doc: improve pipe description
I spent hours trying to make it work only to learn that it's not supported in node anymore, so I thought I'd save other people the time in the future.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
I spent hours trying to make it work only to learn that it's not supported in node anymore, so I thought I'd save other people the time in the future.