Update az-overview.md

changed date

Author: Obeling

articles/availability-zones/az-overview.md

@@ -4,7 +4,7 @@ description: Learn about regions and Availability Zones in Azure to meet your te
 author: prsandhu
 ms.service: azure
 ms.topic: conceptual
-ms.date: 02/23/2021
+ms.date: 04/09/2021
 ms.author: prsandhu
 ms.reviewer: cynthn
 ms.custom: fasttrack-edit, mvc