[7.2] Change remote messaging row in OpenShift doc

As per emails from bilge and bstansbe@redhat.com, the row for remote messaging in the 'Differences between JBoss EAP and JBoss EAP for OpenShift' table should be changed from:

ActiveMQ Artemis for inter-pod and remote messaging is supported. HornetQ is only supported for intra-pod messaging and only enabled when ActiveMQ Artemis is absent. JBoss EAP for OpenShift 7 includes ActiveMQ Artemis as a replacement for HornetQ.

to

JBoss AMQ for inter-pod and remote messaging is supported. ActiveMQ Artemis is only supported for messaging within a single pod with JBoss EAP instances, and is only enabled when JBoss AMQ is absent.