Update route-maps-about.md

Updating limitations

Author: cfields475

articles/virtual-wan/route-maps-about.md

@@ -64,6 +64,8 @@ Before using Route-maps, take into consideration the following limitations:
 * Modifying the *Default* route is only supported when the default route is learned from on-premises or an NVA.
 * A prefix can be modified either by Route-maps, or by NAT, but not both.
 * Route-maps won't be applied to the [hub address space](virtual-wan-site-to-site-portal.md#hub).
+* Modifying the Default route is only supported when the default route is learned from on-Prem or an NVA.
+* Applying Route-Maps on NVAs in a spoke VNet is not supported. 
 
 ## Configuration workflow
 
@@ -157,4 +159,4 @@ For more information and steps, see [Monitor Route-maps using the Route Map dash
 
 * To configure Route-maps, see [How to configure Route-maps](route-maps-how-to.md).
 * To monitor routes, AS Path, and BGP communities, see the
-[Route Map dashboard](route-maps-dashboard.md).
+[Route Map dashboard](route-maps-dashboard.md).