TELCODOCS-1828:Clarify supported format for osImages.openshiftVersion…

… in ZTP docs

modules/ztp-configuring-the-cluster-for-a-disconnected-environment.adoc

@@ -54,6 +54,7 @@ data:
 <3> The configuration file for the mirror registry. The mirror registry configuration adds mirror information to the `/etc/containers/registries.conf` file in the discovery image. The mirror information is stored in the `imageContentSources` section of the `install-config.yaml` file when the information is passed to the installation program. The Assisted Service pod that runs on the hub cluster fetches the container images from the configured mirror registry.
 <4> The URL of the mirror registry. You must use the URL from the `imageContentSources` section by running the `oc adm release mirror` command when you configure the mirror registry. For more information, see the _Mirroring the OpenShift Container Platform image repository_ section.
 <5> The registries defined in the `registries.conf` file must be scoped by repository, not by registry. In this example, both the `quay.io/example-repository` and the `mirror1.registry.corp.com:5000/example-repository` repositories are scoped by the `example-repository` repository.
+
 +
 This updates `mirrorRegistryRef` in the `AgentServiceConfig` custom resource, as shown below:
 +
@@ -84,12 +85,13 @@ spec:
   mirrorRegistryRef:
     name: assisted-installer-mirror-config <2>
   osImages:
-    - openshiftVersion: <ocp_version>
-      url: <iso_url> <3>
+    - openshiftVersion: <ocp_version> <3>
+      url: <iso_url> <4>
 ----
-<1> Set the `AgentServiceConfig` namespace to `multicluster-engine` to match the `ConfigMap` namespace
-<2> Set `mirrorRegistryRef.name` to match the definition specified in the related `ConfigMap` CR
-<3> Set the URL for the ISO hosted on the `httpd` server
+<1> Set the `AgentServiceConfig` namespace to `multicluster-engine` to match the `ConfigMap` namespace.
+<2> Set `mirrorRegistryRef.name` to match the definition specified in the related `ConfigMap` CR.
+<3> Set the {product-title} version to either the x.y or x.y.z format.
+<4> Set the URL for the ISO hosted on the `httpd` server.
 
 [IMPORTANT]
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