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
      - [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:
Documentation is not updated, a mandatory parameter --node-upgrade-type is not mentioned

following the documentation from here fails :
https://github.com/stolostron/rhacm-docs/blob/2.9_stage/clusters/hosted_control_planes/scale_nodepool_hosted_bm.adoc#adding-node-pools

Trying to run :
(.venv) [kni@ocp-edge77 ocp-edge-auto_cluster]$ hcp create nodepool agent   --cluster-name $CLUSTER_NAME   --name $NODEPOOL_NAME   --node-count $WORKER_COUNT 

Renault in an err:
  3.    spec.management.upgradeType: Unsupported value: "": supported values: "Replace", "InPlace"

   (.venv) [kni@ocp-edge77 ocp-edge-auto_cluster]$ hcp create nodepool agent --help 
Creates basic functional NodePool resources for Agent platformUsage:
  hcp create nodepool agent [flags]Flags:
  -h, --help   help for agentGlobal Flags:
      --cluster-name string             The name of the HostedCluster nodes in this pool will join. (default "example")
      --name string                     The name of the NodePool.
      --namespace string                The namespace in which to create the NodePool. (default "clusters")
      --node-count int32                The number of nodes to create in the NodePool. (default 2)
      --node-upgrade-type UpgradeType   The NodePool upgrade strategy for how nodes should behave when upgraded. Supported options: Replace, InPlace
      --release-image string            The release image for nodes; if this is empty, defaults to the same release image as the HostedCluster.
      --render                          Render output as YAML to stdout instead of applying.
(.venv) [kni@ocp-edge77 ocp-edge-auto_cluster]$ 

This seems to be the correct syntax :

(.venv) [kni@ocp-edge77 ocp-edge-auto_cluster]$ hcp create nodepool agent   --cluster-name $CLUSTER_NAME   --name $NODEPOOL_NAME   --node-count $WORKER_COUNT --node-upgrade-type Replace
NodePool hosted-0-extra-cpu created
(.venv) [kni@ocp-edge77 ocp-edge-auto_cluster]$

More details are here