Linking to document regarding az aks get credentials

Author: naioja

articles/aks/egress-outboundtype.md

@@ -540,3 +540,6 @@ You should see an image of the Azure voting app.
 See [Azure networking UDR overview](https://docs.microsoft.com/azure/virtual-network/virtual-networks-udr-overview).
 
 See [how to create, change, or delete a route table](https://docs.microsoft.com/azure/virtual-network/manage-route-table).
+
+<!-- LINKS - internal -->
+[az-aks-get-credentials]: /cli/azure/aks?view=azure-cli-latest#az-aks-get-credentials