fixed bug in documentation for $smarty->default_modifiers

docs/programmers.sgml

@@ -477,8 +477,9 @@ $smarty->autoload_filters = array('pre' => array('trim', 'stamp'),
 	  This is an array of modifiers to implicitly apply to every variable in a
 	  template. For example, to HTML-escape every variable by default, use
 	  array('escape:"htmlall"'); To make a variable exempt from default
-	  modifiers, pass the special "nodefaults" modifier to it, such as
-	  {$var|nodefaults}.
+	  modifiers, pass the special "smarty" modifier with a parameter value of
+	  "nodefaults" modifier to it, such as
+	  {$var|smarty:nodefaults}.
       </para>
      </sect1>
     </chapter>