update H1 and TOC

Author: markingmyname

articles/mysql/TOC.yml

@@ -252,9 +252,9 @@
         href: flexible-server/how-to-troubleshoot-cli-errors.md
     - name: Security
       items:
-      - name: Set data encryption with Azure portal
+      - name: Data encryption with Azure portal
         href: flexible-server/tutorial-data-encryption-mysql-flexible-server-portal.md
-      - name: Set data encryption with Azure CLI
+      - name: Data encryption with Azure CLI
         href: flexible-server/tutorial-data-encryption-mysql-flexible-server-cli.md        
   - name: Samples
     items:

articles/mysql/flexible-server/tutorial-data-encryption-mysql-flexible-server-portal.md

@@ -10,7 +10,7 @@ ms.subservice: flexible-server
 ms.topic: conceptual
 ---
 
-# Tutorial: Set data encryption for Azure Database for MySQL - Flexible Server by using the Azure portal Preview
+# Tutorial: Data encryption for Azure Database for MySQL - Flexible Server by using the Azure portal Preview
 
 This tutorial shows you how to set up and manage data encryption for your Azure Database for MySQL flexible server.