Removed unsupported message for k8s nmstate

Author: Shubha Narayanan

modules/nw-ovn-kubernetes-matrix.adoc

@@ -47,7 +47,7 @@ ifeval::["{context}" == "about-openshift-sdn"]
 
 |IPsec encryption|Not supported|Supported
 
-|IPv6|Not supported|Supported ^[3]^ ^[4]^
+|IPv6|Not supported|Supported ^[3]^
 
 |Kubernetes network policy|Supported|Supported
 
@@ -65,6 +65,4 @@ endif::[]
 2. Egress router for OVN-Kubernetes supports only redirect mode.
 
 3. IPv6 is supported only on bare metal, vSphere, IBM Power, and {ibmzProductName} clusters.
-
-4. IPv6 single stack does not support xref:../../networking/k8s_nmstate/k8s-nmstate-about-the-k8s-nmstate-operator.adoc#k8s-nmstate-about-the-k8s-nmstate-operator[Kubernetes NMState].
 --