(DOCSP-36154): Remove duplicate sentence (#666)

* Fix duplicate sentence

* Add meta description and facet values

source/sync/migrate-sync-modes.txt

@@ -4,6 +4,13 @@
 Migrate Device Sync Modes
 =========================
 
+.. meta:: 
+   :description: Learn how to migrate from Partition-Based Sync to Flexible Sync.
+
+.. facet::
+   :name: genre 
+   :values: tutorial
+
 .. contents:: On this page
    :local:
    :backlinks: none
@@ -344,9 +351,9 @@ object model's name. For example, a ``Person`` object model's subscription
 name would be ``flx_migrated_Person``.
 
 You can keep the automatically-generated subscriptions if you don't want to
-remove and recreate them. But because these subscriptions aren't created in your client code, they may make it harder for you to maintain and extend client code.
-subscriptions aren't created in your client code, they may make it harder to
-maintain and extend client code. 
+remove and recreate them. But because these subscriptions aren't created in 
+your client code, they may make it harder for you to maintain and extend 
+client code.
 
 For more information about updating client code after migrating from 
 Partition-Based Sync to Flexible Sync, refer to: