Create an informative issue

With mirrored registries the release-image must be specified by using a digest, so the mirror-by-digest-only = true must be set .

I think we could note this in ACM documentation .

Prerequisite: Start with what we have

1.5.3.1.4. Enabling central infrastructure management in disconnected environments

https://access.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.9/html-single/clusters/index#enable-cim-disconnected

Describe the changes in the doc and link to your dev story

Provide info for the following steps:

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
      - [ ] 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: