DOCS ONLY.
add manifest documentation for uses-feature and supports-screens elements.
also update the navigation and manifest home page,
update the uses-sdk element to include new maxSdk and targeSdk attributes,
and add some sample code to DisplayMetrics to query the device for screen info.
diff --git a/docs/html/guide/guide_toc.cs b/docs/html/guide/guide_toc.cs
index 2127187..11f8c7b 100644
--- a/docs/html/guide/guide_toc.cs
+++ b/docs/html/guide/guide_toc.cs
@@ -145,7 +145,9 @@
           <li><a href="<?cs var:toroot ?>guide/topics/manifest/provider-element.html">&lt;provider&gt;</a></li>
           <li><a href="<?cs var:toroot ?>guide/topics/manifest/receiver-element.html">&lt;receiver&gt;</a></li>
           <li><a href="<?cs var:toroot ?>guide/topics/manifest/service-element.html">&lt;service&gt;</a></li>
+          <li><a href="<?cs var:toroot ?>guide/topics/manifest/supports-screens-element.html">&lt;supports-screens&gt;</a></li>  <!-- ##api level 4## -->
           <li><a href="<?cs var:toroot ?>guide/topics/manifest/uses-configuration-element.html">&lt;uses-configuration&gt;</a></li>
+          <li><a href="<?cs var:toroot ?>guide/topics/manifest/uses-feature-element.html">&lt;uses-feature&gt;</a></li> <!-- ##api level 4## -->
           <li><a href="<?cs var:toroot ?>guide/topics/manifest/uses-library-element.html">&lt;uses-library&gt;</a></li>
           <li><a href="<?cs var:toroot ?>guide/topics/manifest/uses-permission-element.html">&lt;uses-permission&gt;</a></li>
           <li><a href="<?cs var:toroot ?>guide/topics/manifest/uses-sdk-element.html">&lt;uses-sdk&gt;</a></li>
@@ -407,6 +409,9 @@
                <span class="zh-TW">附錄</span>
     </h2>
     <ul>
+      <li><a href="<?cs var:toroot ?>guide/appendix/api-levels.html">
+            <span class="en">Android API Levels</span>
+          </a></li>
       <li><a href="<?cs var:toroot ?>guide/appendix/media-formats.html">
             <span class="en">Supported Media Formats</span>
           </a></li>