doc: add backlog for more server.listen variants
Actually, backlog is even supported for the options variant; but I think this would be too confusing if documented, as the options.backlog property takes precedence.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Actually, backlog is even supported for the options variant; but I think this would be too confusing if documented, as the options.backlog property takes precedence.