Address review feedback in downstream RHEL and OCP installation guides

As reported by rhn-support-jnovotny in the steps for verifying the deployment in the file proc-verifying-debezium-installation-on-rhel.adoc in the RHEL Installation guide, the topic argument in the following kafka-console-consumer.sh command is incorrect:

kafka-console-consumer.sh
> --bootstrap-server localhost:9092
> --from-beginning
> --property print.key=true
> --topic=inventory_connector_mysql.inventory.products_on_hand

The correct topic argument is dbserver1.inventory.products_on_hand.

As reported by mmedek@redhat.com, in the Debezium OCP installation guide, the examples include a mixture of topic prefixes, with some instance using inventory_connector_mysql and some using inventory-connector-mysql. Update the guide to consistently use the same value across the entire document.