Expand a bit note about /stand, which is not exists at all on 5.2 and later

svn path=/head/; revision=23320

en_US.ISO8859-1/books/handbook/cutting-edge/chapter.sgml

@@ -1412,7 +1412,8 @@ Script done, &hellip;</screen>
           <filename>/rescue</filename> directory is automatically updated
           for the user with current, statically compiled binaries during
 	  <command>make installworld</command>, thus obsoleting the need
-	  to update <filename>/stand</filename>.</para>
+	  to update <filename>/stand</filename> (which does not exists an
+	  all on FreeBSD&nbsp;5.2 and later).</para>
       </note>
       
       <para>For the sake of completeness, you may want to update the files in