Update cni.md

Author: sharmasushant

docs/cni.md

@@ -79,7 +79,7 @@ Logs generated by `azure-vnet` plugin are available in `/var/log/azure-vnet.log`
 
 Logs generated by `azure-vnet-ipam` plugin are available in `/var/log/azure-vnet.log` on Linux and `c:\cni\azure-vnet-ipam.log` on Windows.
 
-## Upgrading CNI on existing kubernetes cluster deployed via aks or acs-engine
+## Upgrading CNI on existing kubernetes cluster deployed using acs-engine
 
 1. ssh into a master node
 ```bash