Correction to Vnet

Vnet should be VNet

Author: sangling

articles/aks/use-managed-identity.md

@@ -146,7 +146,7 @@ The output should resemble the following:
 
 ### Add role assignment
 
-For Vnet, attached Azure disk, static IP address, route table which are outside the default worker node resource group, you need to assign the `Contributor` role on custom resource group.
+For VNet, attached Azure disk, static IP address, route table which are outside the default worker node resource group, you need to assign the `Contributor` role on custom resource group.
 
 ```azurecli-interactive
 az role assignment create --assignee <control-plane-identity-principal-id> --role "Contributor" --scope "<custom-resource-group-resource-id>"