removed public peering

Author: duongau

articles/migrate/replicate-using-expressroute.md

@@ -175,7 +175,7 @@ For proxy bypass, you can add a proxy bypass rule for the cache storage account
 
 ## Replicate data by using an ExpressRoute circuit with Microsoft peering
 
-You can use Microsoft peering or an existing public peering domain (deprecated for new ExpressRoute connections) to route your replication traffic through an ExpressRoute circuit.
+You can use Microsoft peering to route your replication traffic through an ExpressRoute circuit.
 
 ![Diagram that shows replication with Microsoft peering.](./media/replicate-using-expressroute/replication-with-microsoft-peering.png)