add haproxy note

Author: SNiemann15

modules/machine-user-infra-machines-ibm-z-kvm.adoc

@@ -122,4 +122,10 @@ The `os-variant` is case sensitive.
 <3> For `coreos.inst.ignition_url=`, specify the `worker.ign` Ignition file for the machine role. Only HTTP and HTTPS protocols are supported.
 <4> For `coreos.live.rootfs_url=`, specify the matching rootfs artifact for the `kernel` and `initramfs` you are booting. Only HTTP and HTTPS protocols are supported.
 --
++
+[NOTE]
+====
+If you are using HAProxy as a load balancer, update your HAProxy rules for `ingress-router-443` and `ingress-router-80` in the `/etc/haproxy/haproxy.cfg` configuration file.
+====
+
 . Continue to create more compute machines for your cluster.