Added introductory tables to Chrome apps APIs.

chrome/common/extensions/docs/templates/intros/runtime.html

Index: chrome/common/extensions/docs/templates/intros/runtime.html
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+<table class="intro">
+  <tr>
+    <th scope="col"></th>
+    <th scope="col"></th>
+  </tr>
+  <tr>
+    <td><strong>Description:</strong></td>
+    <td>Use the <code>chrome.runtime</code> module
+    to retrieve the background page, return details about the manifest,
+    and listen for and respond to events in the app or extension lifecycle.
+    You can also use this API to convert the relative path
+    of URLs to fully-qualified URLs.</td>
+  </tr>
+  <tr>
+    <td><strong>Availability:</strong></td>
+    <td>Google Chrome 22</td>
+  </tr>
+  <tr>
+    <td><strong>Permissions:</strong></td>
+    <td>None</td>
+  </tr>
+  <tr>
+    <td><strong>Learn more:</strong></td>
+    <td><a href="app_lifecycle.html">Manage App Lifecycle</a><br>
+    <a href="event_pages.html">Event Pages</a></td>
+  </tr>
+</table>