CNV-70954: Update CUDN YAML example

Author: abrennan89

modules/virt-creating-a-primary-cluster-udn.adoc

@@ -2,8 +2,8 @@
 //
 // * virt/vm_networking/virt-connecting-vm-to-primary-udn.adoc
 
-:_mod-docs-content-type: PROCEDURE                                
-[id="virt-creating-a-primary-cluster-udn_{context}"]                                  
+:_mod-docs-content-type: PROCEDURE
+[id="virt-creating-a-primary-cluster-udn_{context}"]
 = Creating a primary cluster-scoped user-defined network by using the CLI
 
 [role="_abstract"]
@@ -20,6 +20,7 @@ Example `ClusterUserDefinedNetwork` manifest:
 +
 [source,yaml]
 ----
+apiVersion: k8s.ovn.org/v1
 kind: ClusterUserDefinedNetwork
 metadata:
   name: cudn-l2-net # <1>