upadte ms.date frontmatter prop to indicate when doc updated

Author: andrewconnell

docs/declarative-customization/view-formatting.md

@@ -1,7 +1,7 @@
 ---
 title: Use view formatting to customize SharePoint
 description: Customize how views in SharePoint lists and libraries are displayed by constructing a JSON object that describes the elements that are displayed in a list view, and the styles to be applied to those elements.
-ms.date: 03/30/2021
+ms.date: 05/07/2021
 localization_priority: Priority
 ---