OCPBUGS-39229: Add reference IBU from ztp-site-generate

Author: amolnar-rh

modules/ztp-image-based-upgrade-prep.adoc

@@ -7,6 +7,17 @@
 
 When you deploy the {lcao} on a cluster, an `ImageBasedUpgrade` CR is automatically created. You update this CR to specify the image repository of the seed image and to move through the different stages.
 
+.ImageBasedUpgrade CR in the ztp-site-generate container
+[source,yaml]
+----
+apiVersion: lca.openshift.io/v1
+kind: ImageBasedUpgrade
+metadata:
+  name: upgrade
+spec:
+  stage: Idle
+----
+
 .Prerequisites
 
 * Create policies and `ConfigMap` objects for resources used in the image-based upgrade. For more information, see "Creating ConfigMap objects for the image-based upgrade with {ztp}.