Clarify the use of the three AMQ Broker Operators in OperatorHub

We have 3 AMQ Broker Operators in OperatorHub:

• Red Hat Integration - AMQ Broker LTS with alpha channel for LTS version
• Red Hat Integration - AMQ Broker with channels: 7.x and 7.8.X , alpha, current, current-76
• Red Hat Integration - AMQ Broker RHEL 8 (MultiArch): with two channels 7.x and 7.8.X

We have to clarify the use of each operator, and what's the right one to upgrade to the 7.9.0

Thread : https://chat.google.com/room/AAAA8CrgHgk/nqQE0JsMdkQ