Added introductory tables to Chrome apps APIs.

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

+<table class="intro">
+  <tr>
+    <th scope="col"></th>
+    <th scope="col"></th>
+  </tr>
+  <tr>
+    <td><strong>Description:</strong></td>
+    <td>Use the <code>chrome.contextMenus</code> module
+    to add items to Google Chrome's context menu.
+    You can choose what types of objects
+    your context menu additions apply to,
+    such as images, hyperlinks, and pages.
+  </td>
+  </tr>
+  <tr>
+    <td><strong>Availability:</strong></td>
+    <td>Google Chrome 6</td>
+  </tr>
+  <tr>
+    <td><strong>Permissions:</strong></td>
+    <td><code>"contextMenus"</code></td>
+  </tr>
+</table>
+
+<h2 id="usage">Usage</h2>
+
 <p>
-The context menus module allows you
-to add items to Google Chrome's context menu.
+Context menu items can appear in any document
+(or frame within a document),
+even those with file:// or chrome:// URLs.
+To control which documents your items can appear in,
+specify the documentUrlPatterns field
+when you call the create() or update() method.
 </p>
 
 <p>
-You can choose what types of objects
-your context menu additions apply to,
-such as images, hyperlinks, and pages.
-</p>
-
-<p>
 You can create as many context menu items
 as you need, but if more than one
 from your extension is visible at once,
 Google Chrome automatically collapses them
 into a single parent menu.
 </p>
 
-<p>
-Context menu items can appear in any document
-(or frame within a document),
-even those with file:// or chrome:// URLs.
-To control which documents your items can appear in,
-specify the documentUrlPatterns field
-when you call the create() or update() method.
-</p>
-
 <h2 id="manifest">Manifest</h2>
 <p>You must declare the "contextMenus" permission
 in your extension's manifest to use the API.
 Also, you should specify a 16x16-pixel icon
 for display next to your menu item.
 For example:
 </p>
 
 <pre>{
   "name": "My extension",
   ...
   "permissions": [
     <b>"contextMenus"</b>
   ],
   "icons": {
     <b>"16": "icon-bitty.png",</b>
     "48": "icon-small.png",
     "128": "icon-large.png"
   },
   ...
 }</pre>
 
 <h2 id="examples">Examples</h2>
 
 <p>
 You can find samples of this API on the
 <a href="samples.html#contextMenus">sample page</a>.