update date for tomorrow's GA

Author: cabailey

articles/sentinel/bookmarks.md

@@ -15,7 +15,7 @@ ms.topic: conceptual
 ms.custom: mvc
 ms.tgt_pltfrm: na
 ms.workload: na
-ms.date: 09/20/2019
+ms.date: 09/24/2019
 ms.author: rkarlin
 ---