note -> warning, remove "should use" comment

svn path=/head/; revision=23798

en_US.ISO8859-1/books/handbook/firewalls/chapter.sgml

@@ -949,16 +949,15 @@ sh /etc/ipf.rules.script</programlisting>
          firewalls are much, much securer than exclusive firewall rule
          sets and is the only rule set type covered herein.</para>
 
-	<!-- XXX; should use <warning> here -->
-       <note>
-         <para>Warning, when working with the firewall rules, always,
+       <warning>
+         <para>When working with the firewall rules, always,
            always do it on the console of the system running the
            firewall or you can end up locking your self out.
 	   Alternatively, you may setup a cronjob to flush the
 	   firewall rules say every five minutes.
 	   This may not be acceptable for a corporate firewall,
 	   but should be ok for a home firewall.</para>
-       </note>
+       </warning>
      </sect2>
 
      <sect2>