=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
Note the scaladoc:

    /**
      * Scala API: Send the message created by the `deliveryIdToMessage` function to
      * the `destination` actor. It will retry sending the message until
      * the delivery is confirmed with [[#confirmDelivery]]. Correlation
      * between `deliver` and `confirmDelivery` is performed with the
      * `deliveryId` that is provided as parameter to the `deliveryIdToMessage`
      * function. The `deliveryId` is typically passed in the message to the
      * destination, which replies with a message containing the same `deliveryId`.
      *
      * The `deliveryId` is a strictly monotonically increasing sequence number without
      * gaps. The same sequence is used for all destinations of the actor, i.e. when sending
      * to multiple destinations the destinations will see gaps in the sequence if no
      * translation is performed.
      *
      * During recovery this method will not send out the message, but it will be sent
      * later if no matching `confirmDelivery` was performed.
      *
      * This method will throw [[AtLeastOnceDelivery.MaxUnconfirmedMessagesExceededException]]
      * if [[numberOfUnconfirmed]] is greater than or equal to [[#maxUnconfirmedMessages]].
      */