update doc timestamp frontmatter

updated timestamp to reflect when doc was updated

Author: andrewconnell

docs/general-development/save-download-and-upload-a-sharepoint-site-as-a-template.md

@@ -1,7 +1,7 @@
 ---
 title: Save, download, and upload a SharePoint site as a template
 description: Learn how to design and build robust applications by using SharePoint site templates.
-ms.date: 12/14/2020
+ms.date: 11/16/2021
 ms.prod: sharepoint
 ms.assetid: 2e637172-ddac-4a70-bd77-55a1645a3db1
 ms.localizationpriority: high