Make description of utility library complete.

[SVN r13114]

libs/libraries.htm

@@ -361,8 +361,10 @@ out how to build object libraries, when needed.</p>
     <li><a href="smart_ptr/index.htm">smart_ptr</a> - Five smart
         pointer class templates, from Greg Colvin, Beman Dawes,
         Peter Dimov, and Darin Adler.</li>
-  <li><a href="utility/utility.htm">utility</a>  - <tt>checked_delete</tt> and <tt>checked_array_delete</tt>
-    function templates, from Beman Dawes and others.</li>
+    <li><a href="utility/utility.htm">utility</a> - Class <b>noncopyable</b>
+        plus <b>checked_delete()</b>, <b>checked_array_delete()</b>, <b>next(),</b>&nbsp;
+      <b>prior()</b>
+        function templates, plus <b>base-from-member idiom</b>, from Dave Abrahams and others. </li>
 </ul>
 
 <h3><a name="Miscellaneous">Miscellaneous</a></h3>
@@ -384,7 +386,7 @@ out how to build object libraries, when needed.</p>
     <li><a href="utility/utility.htm">utility</a> - Class <b>noncopyable</b>
         plus <b>checked_delete()</b>, <b>checked_array_delete()</b>, <b>next(),</b>&nbsp;
       <b>prior()</b>
-        function templates, from Dave Abrahams and others. </li>
+        function templates, plus <b>base-from-member idiom</b>, from Dave Abrahams and others. </li>
 </ul>
 
 <h3>Broken compiler <a name="workarounds">workarounds</a></h3>