Update bastion-limits.md

should be based on instance not basic sku

Author: isamorris

includes/bastion-limits.md

@@ -9,11 +9,12 @@
  ms.author: cherylmc
  ms.custom: include file
 ---
+An instance is an optimized Azure VM that is created when you configure Azure Bastion. When you configure Azure Bastion using the Basic SKU, 2 instances are created. If you use the Standard SKU, you can specify the number of instances between 2-50.
 
 | Workload Type* | Session Limit per Instance** |
 | --- | --- |
-| Light |50 |
-| Medium |25 |
+| Light |25 |
+| Medium |20 |
 | Heavy |2 |
 
 *These workload types are defined here: [Remote Desktop workloads](/windows-server/remote/remote-desktop-services/remote-desktop-workloads)<br>