=doc #15538 Updating documentation on deliver and confirmDelivery for Scala, Java and Lambda-java
Merge pull request #15794 from dlpb/deliver-and-confirmDelivery-documentation-dlpb

=doc #15538 Updating documentation on deliver and confirmDelivery
=doc #16000 fix tck-experimental version
Merge pull request #16000 from xuwei-k/tck-version-in-document

=doc #16000 fix tck-experimental version
Merge branch 'master' of https://github.com/BPoserow/akka into fix-fsm-timeout-docs-15542-bposerow