Remove note about Calico network policies in kubenet docs

AKS kubenet docs had a note about enabling Calico network policies. We're trying to encourage people to move to Azure CNI Overlay, and enabling Calico introduces a separate step in this migration (first remove Calico, then upgrade to Overlay).

Since we already have docs about enabling Calico elsewhere, remove the note about enabling Calico from the kubenet docs.

Author: wedaly

articles/aks/configure-kubenet.md

@@ -153,19 +153,6 @@ For more information to help you decide which network model to use, see [Compare
     * The pod IP address range is used to assign a */24* address space to each node in the cluster. In the following example, the *--pod-cidr* of *10.244.0.0/16* assigns the first node *10.244.0.0/24*, the second node *10.244.1.0/24*, and the third node *10.244.2.0/24*.
     * As the cluster scales or upgrades, the Azure platform continues to assign a pod IP address range to each new node.
 
-> [!NOTE]
-> If you want to enable an AKS cluster to include a [Calico network policy][calico-network-policies], you can use the following command:
->
-> ```azurecli-interactive
-> az aks create \
->     --resource-group myResourceGroup \
->     --name myAKSCluster \
->     --node-count 3 \
->     --network-plugin kubenet \
->     --network-policy calico \
->     --vnet-subnet-id $SUBNET_ID 
-> ```
-
 ### Create an AKS cluster with user-assigned managed identity
 
 #### Create a managed identity