Adding TOC item for the document. Please review before approval.

Author: fauhse

articles/storage/files/TOC.yml

@@ -141,6 +141,8 @@
       href: storage-sync-offline-data-transfer.md
     - name: Move data to and from Azure Storage
       href: ../common/storage-moving-data.md?toc=%2fazure%2fstorage%2ffiles%2ftoc.json
+    - name: Migrate to Azure File Sync from StorSimple
+      href: storage-sync-files-storsimple-migration.md
     - name: Move data with AzCopy
       items:
         - name: Get started