Create an informative issue (See each section, incomplete templates/issues won't be triaged)

Using the current documentation as a model, please complete the issue template. 

Note: Doc team updates the current version and the two previous versions (n-2). For earlier versions, we will address only high-priority, customer-reported issues for releases in support.

Prerequisite: Start with what we have

Always look at the current documentation to describe the change that is needed. Use the source or portal link for Step 4:

 - Use the Customer Portal: https://access.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes

 - Use the GitHub link to find the staged docs in the repository: https://github.com/stolostron/rhacm-docs 

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. - [X] Mandatory for GA content:
            
       - [ ] Add steps and/or other important conceptual information here: 
       Incorrect link to must-gather provided, the image changed from rhel8 to rhel9
            
       - [ ] 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. - [X] Mandatory for bugs: What is the diff? Clearly define what the problem is, what the change is, and link to the current documentation:

Must-gather procedure step 3 command needs to be changed to:

Add the multicluster engine for Kubernetes image that is used for gathering data and the directory. Run the following command with the current supported version:

oc adm must-gather --image=registry.redhat.io/multicluster-engine/must-gather-rhel9:v2.5 --dest-dir=<directory>