[2005] wording update based on review suggestion

doc/guide/bind10-guide.xml

@@ -2162,8 +2162,10 @@ DDNS/zones[0]/update_acl[1]	{"action": "ACCEPT", "from": "::1", "key": "key.exam
       <para>
 	The difference of two versions of a zone, before and after a
 	DDNS transaction, is automatically recorded in the underlying
-	data source, and can be retrieved in the form of outbound IXFR.
-	There has to be no configuration to make this possible.
+	data source, and can be retrieved in the form of outbound
+	IXFR.
+	This is done automaticallyl; it does not require specific
+	configuration to make this possible.
       </para>
     </section>
   </chapter>