Update known-issues-troubleshooting-dms.md

Added classic

Author: abhims14

articles/dms/known-issues-troubleshooting-dms.md

@@ -1,6 +1,6 @@
 ---
 title: "Common issues - Azure Database Migration Service"
-description: Learn about how to troubleshoot common known issues/errors associated with using Azure Database Migration Service.
+description: Learn about how to troubleshoot common known issues/errors associated with using Azure Database Migration Service(classic).
 author: abhims14
 ms.author: abhishekum
 ms.reviewer: randolphwest
@@ -12,9 +12,9 @@ ms.custom:
   - sql-migration-content
 ---
 
-# Troubleshoot common Azure Database Migration Service issues and errors
+# Troubleshoot common Azure Database Migration Service (classic) issues and errors
 
-This article describes some common issues and errors that Azure Database Migration Service users can come across. The article also includes information about how to resolve these issues and errors.
+This article describes some common issues and errors that Azure Database Migration Service(classic) users can come across. The article also includes information about how to resolve these issues and errors.
 
 ## Migration activity in queued state