QPID-5980: javadoc fixups continue

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1616811 13f79535-47bb-0310-9956-ffa450edef68
QPID-4307 : [Java Broker] prevent the copying/moving of messages onto queues on which the message already exists

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1616813 13f79535-47bb-0310-9956-ffa450edef68