Merge pull request #274807 from sreekzz/ambari-migration

New Ambari migration page

Author: ttorble

articles/hdinsight/TOC.yml

@@ -651,6 +651,8 @@ items:
         href: ./hadoop/troubleshoot-wasbs-storage-exception.md
       - name: Manage disk space
         href: ./hadoop/troubleshoot-disk-space.md
+      - name: Ambari user configs migration
+        href: ./migrate-ambari-recent-version-hdinsight.md  
 - name: Apache Kafka
   items:
   - name: Overview