Merge pull request #49460 from apwestgarth/patch-8

Added details of Windows OS Patches included

Author: PRMerger17

articles/azure-stack/azure-stack-app-service-release-notes-update-three.md

@@ -13,7 +13,7 @@ ms.workload: na
 ms.tgt_pltfrm: na
 ms.devlang: na
 ms.topic: article
-ms.date: 08/15/2018
+ms.date: 08/20/2018
 ms.author: anwestg
 ms.reviewer: brenduns
 
@@ -66,6 +66,10 @@ Azure App Service on Azure Stack Update 3 includes the following improvements an
   - Added Wincache 2.0.0.8
   - Updated Git for Windows to v 2.17.1.2
   - Updated Kudu to 74.10611.3437
+  
+- **Updates to underlying operating system of all roles**:
+  - [Servicing stack update for Windows Server 2016 for x64-based Systems (KB4132216)](https://support.microsoft.com/help/4132216/servicing-stack-update-for-windows-10-1607-may-17-2018)
+  - [2018-07 Cumulative Update for Windows Server 2016 for x64-based Systems (KB4338822)](https://support.microsoft.com/help/4338822/windows-10-update-kb4338822)
 
 ### Post Update Steps (optional)