Add run_sync_tables.rst

doc/manual/source/operations/run_sync_tables.rst

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+Running Sync Tables
+==============
+
+If you are working with the **Sync Tables** feature, you must run a rake task to trigger the synchronization of the dataset. This rake retrieves all sync tables that should get synchronized, and puts the synchronization tasks at Resque:
+
+.. highlight:: bash
+
+::
+
+    bundle exec rake cartodb:sync_tables[true]
+
+You might want to set up a cron so that this task is executed periodically in an automated way.
+
+
+