Update simple TC doc with 4.4.7 workaround for lack of 'flow'

Signed-off-by: Tom Eastep <teastep@shorewall.net>

docs/simple_traffic_shaping.xml

@@ -78,6 +78,11 @@ eth0                   External</programlisting>
       <para>RHEL5-based systems such as <trademark>CentOS</trademark> 5 and
       <trademark>Foobar</trademark> 5 are known to experience this
       error.</para>
+
+      <para><emphasis role="bold">Update</emphasis>: Beginning with Shorewall
+      4.4.7, Shorewall can determine that some environments, such as RHEL5 and
+      derivatives, are incapable of using the TYPE parameter and simply ignore
+      it.</para>
     </note>
 
     <para>With this simple configuration, packets to be sent through interface