docs(k8s): add link to vpc doc

Author: bene2k1

pages/kubernetes/reference-content/secure-cluster-with-private-network.mdx

@@ -46,6 +46,10 @@ Worker node pools with controlled isolation inside a Private Network have both p
   By removing or detaching the Public Gateway from the Private Network, a node pool with full isolation can lead to a single point of failure in the cluster, as nodes will no longer be able to reach their control plane.
 </Message>
 
+<Message type="tip">
+  Refer to the dedicated VPC documentation to learn about [Scaleway DNS for VPC and Private Networks](/vpc/reference-content/dns/).
+</Message>
+
 ## Scaleway product compatibility
 
 ### Can I use a Public Gateway with my Private Network to exit all outgoing traffic from the nodes?