Merge pull request #78782 from zr-msft/aks-fix-bad-link

[AKS] fixed missing links

Author: PRMerger10

articles/aks/coredns-custom.md

@@ -190,5 +190,7 @@ To learn more about core network concepts, see [Network concepts for application
 [kubectl delete]: https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#delete
 [coredns hosts]: https://coredns.io/plugins/hosts/
 
-<!-- LINKS - external -->
+<!-- LINKS - internal -->
 [concepts-network]: concepts-network.md
+[aks-quickstart-cli]: kubernetes-walkthrough.md
+[aks-quickstart-portal]: kubernetes-walkthrough-portal.md