Add missing metadata descriptions

Author: damabe

docs/vsto/walkthrough-binding-data-to-controls-on-a-word-actions-pane.md

@@ -1,6 +1,7 @@
 ---
 title: "Walkthrough: Bind data to controls on a Word actions pane"
- Bind data to controls on an actions pane in Microsoft Word. The controls demonstrate a master/detail relation between tables in a SQL Server database.
+description: Bind data to controls on an actions pane in Microsoft Word. The controls demonstrate a master/detail relation between tables in a SQL Server database.
+ms.custom: SEO-VS-2020
 titleSuffix: ""
 ms.date: "02/02/2017"
 ms.topic: "conceptual"