OCPBUGS-56989: Swapped out v4InternalSubnet for internalJoinSubnet

Author: dfitzmau

modules/nw-ovn-kubernetes-migration.adoc

@@ -188,7 +188,8 @@ $ oc patch Network.operator.openshift.io cluster --type=merge \
         "ovnKubernetesConfig":{
           "mtu":<mtu>,
           "genevePort":<port>,
-          "v4InternalSubnet":"<ipv4_subnet>"
+          "ipv4":
+            "InternalJoinSubnet": "<ipv4_subnet>"
     }}}}'
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 +