change undefines for Z KVM

Author: SNiemann15

modules/installation-user-infra-generate-k8s-manifest-ignition.adoc

@@ -555,14 +555,14 @@ ifeval::["{context}" == "installing-ibm-z"]
 :!ibm-z:
 endif::[]
 ifeval::["{context}" == "installing-ibm-z-kvm"]
-:!ibm-z-kvm:
+:!ibm-z:
 endif::[]
 ifeval::["{context}" == "installing-restricted-networks-ibm-z"]
 :!ibm-z:
 :!restricted:
 endif::[]
 ifeval::["{context}" == "installing-restricted-networks-ibm-z-kvm"]
-:!ibm-z-kvm:
+:!ibm-z:
 :!restricted:
 endif::[]
 ifeval::["{context}" == "installing-ibm-power"]