update the updated date

Author: tglee

docs/install/visual-studio-administrator-guide.md

@@ -2,7 +2,7 @@
 title: "Visual Studio administrator guide"
 description: "Learn more about how to deploy Visual Studio in an enterprise environment."
 ms.custom: ""
-ms.date: 05/15/2017
+ms.date: 05/29/2018
 ms.technology: vs-acquisition
 ms.prod: visual-studio-dev15
 ms.topic: conceptual