Update k8s-best-practices-multus-macvlan.adoc

Author: mwlinca

modules/k8s-best-practices-multus-macvlan.adoc

@@ -17,6 +17,8 @@ For SR-IOV based SriovNetworkNodePolicy definitions, the MTU setting is omitted
 [IMPORTANT]
 ====
 Applications using SR-IOV multus Network Attachment Definitions must set their required MTU value for virtual functions (VFs) within their pod.
+
+See test case link:https://github.com/redhat-best-practices-for-k8s/certsuite/blob/main/CATALOG.md#networking-network-attachment-definition-sriov-mtu[networking-network-attachment-definition-sriov-mtu]
 ====
 
 From the workload perspective, a defined set of network attachment definitions will be available in the assigned namespace to serve secondary networks for regular usage or to serve for DPDK payloads.