fix date format

Author: JnHs

articles/azure-arc/servers/plan-at-scale-deployment.md

@@ -1,7 +1,7 @@
 ---
 title: How to plan and deploy Azure Arc-enabled servers
 description: Learn how to enable a large number of machines to Azure Arc-enabled servers to simplify configuration of essential security, management, and monitoring capabilities in Azure.
-ms.date: 02/22/22
+ms.date: 02/22/2022
 ms.topic: conceptual
 ---