edit replica set sync from note

Author: Sam Kleinman

source/includes/fact-replica-set-sync-from-is-temporary.rst

@@ -1,5 +1,12 @@
 :dbcommand:`replSetSyncFrom` and :method:`rs.syncFrom()` provide a
-temporary override of default behavior. If the :program:`mongod`
-restarts, the connection to the sync target closes, or the sync target falls
-more than 30s behind another node, :program:`mongod` will revert to
-the default sync logic and target.
+temporary override of default behavior. If: 
+
+- the :program:`mongod` instance restarts,
+
+- the connection to the sync target closes, or 
+
+- the sync target falls more than 30 seconds behind another member of
+  the replica set;
+
+then, the :program:`mongod` instant will revert to the default sync
+logic and target.