Merge pull request #8725 from anandmeg/msdate-update

update msdate

Author: PRMerger17

docs/install/advanced-build-tools-container.md

@@ -2,7 +2,7 @@
 title: Advanced example for containers
 description: Learn about an advanced example for Docker containers. This example Dockerfile uses a specific version tag of the microsoft/dotnet-framework image.
 ms.custom: SEO-VS-2020
-ms.date: 03/25/2020
+ms.date: 09/21/2021
 ms.topic: conceptual
 ms.assetid: e03835db-a616-41e6-b339-92b41d0cfc70
 author: anandmeg