=doc #15538 Updating documentation on deliver and confirmDelivery

=doc #15538 Updating the documentation on deliver and confirmDelivery in the persistence for Scala, Java and Lambda-java
I'd focus more on the fact that you need to correlate *your* id with the *deliveryId*, then you can use your Id, and when it comes back you can confirm the *deliveryId* to be delivered. It's kind of "your own function", but the style of usage is important here