Add windows to the supported OS list for Azure CNI

Author: phealy

articles/aks/azure-cni-overlay.md

@@ -43,7 +43,7 @@ Like Azure CNI Overlay, Kubenet assigns IP addresses to pods from an address spa
 | Network configuration | Simple - no additional configuration required for pod networking | Complex - requires route tables and UDRs on cluster subnet for pod networking |
 | Pod connectivity performance | Performance on par with VMs in a VNet | Additional hop adds minor latency |
 | Kubernetes Network Policies | Azure Network Policies, Calico | Calico |
-| OS platforms supported | Linux only | Linux only |
+| OS platforms supported | Linux and Windows | Linux only |
 
 ## IP address planning