Merge doc change from cupcake: commit '2c44586d'

            <li><a href="<?cs var:toroot ?>guide/practices/ui_guidelines/icon_design.html">Icon Design</a></li>

            <li><a href="<?cs var:toroot ?>guide/practices/ui_guidelines/widget_design.html">App Widget Design</a></li>

            <li><a href="<?cs var:toroot ?>guide/practices/ui_guidelines/activity_task_design.html">Activity and Task Design</a></li>

            <li><a href="<?cs var:toroot ?>guide/practices/ui_guidelines/menu_design.html">Menu Design</a></li>

          </ul>

      </li>

      <li><a href="<?cs var:toroot ?>guide/practices/design/performance.html">Designing for Performance</a></li>

      describes important underlying principles and mechanisms, such as

      multitasking, activity reuse, intents, the activity stack, and 

      tasks. It covers this all from a high-level design perspective.

</dd>

  <dt><a href="{@docRoot}guide/practices/ui_guidelines/menu_design.html">Menu Design Guidelines</a> </dt>

  <dd>Android applications make use of Option menus and Context menus 

      that enable users to perform operations and navigate to other parts

      of your application or to other applications.  These guidelines describe

      the difference between Options and Context menus, how to arrange

      menu items, when to put commands on-screen, and other details about

      menu design.

</dd>

</dl>