api tweak

Author: mlhoop

articles/aks/use-system-pools.md

@@ -123,7 +123,7 @@ az aks nodepool update -g myResourceGroup --cluster-name myAKSCluster -n mynodep
 ## Delete a system node pool
 
 > [!Note]
-> To use system node pools on AKS clusters before API version 2020-03-01, add a new system node pool, then delete the original default node pool.
+> To use system node pools on AKS clusters before API version 2020-03-02, add a new system node pool, then delete the original default node pool.
 
 Previously you could not delete the system node pool, which was the initial default node pool in an AKS cluster. You now have the flexibility to delete any node pool from your clusters. Since AKS clusters require at least one system node pool, you must have at least two system node pools on your AKS cluster before you can delete one of them.