=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
That's not exactly true. The `deliveryId` IS an monotonically without gaps increasing sequence number - yes, but in order to use "yourId" you'd have to keep a correlation map between `deliveryId` and `yourId`, as in this pseudocode:

```scala
deliver(where, id => { relate(id, myId); Envelope(myId, _) }
receive = { case Confirmed(myId) => confirmDelivery(relatedId(myId)) }
```