Submariner is only supported with OpenShift clusters that use the OpenShift SDN CNI or the OVN Kubernetes CNI. I think we had this documented in the past, but it looks like it's no longer the case. We better document this to ensure customers are aware.

1. - [ ] Mandatory Add the required version to the Fix version/s field.

2. - [ ] Mandatory Choose the type of documentation change.

      - [ ] New topic in an existing section or new section
      - [x] Update to an existing topic

3. - [ ] Mandatory for GA content:
            
       - [ ] Add steps and/or other important conceptual information here: 
       
            
       - [ ] Add Required access level for the user to complete the task here:
       

       - [ ] Add verification at the end of the task, how does the user verify success (a command to run or a result to see?)
     
     
       - [ ] Add link to dev story here:

4. - [ ] Mandatory for bugs: What is the diff? Clearly define what the problem is, what the change is, and link to the current documentation:

I am not sure where is the best place to document this, but I guess it should be within the main Submariner guide: https://access.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.7/html-single/add-ons/index#submariner

We need to fix this for ACM 2.8, and also 2.7 and 2.6.