Fix some typos, broken links and other issues in extension docs

chrome/common/extensions/docs/templates/articles/manifestVersion.html

 <h1>Manifest Version</h1>
 
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@@ skipping 181 matching lines @@
             the <code>default_popup</code> property
           </a> or $ref:pageAction.setPopup instead.
         </p>
       </li>
       <li>
         <p>
           The <code>default_popup</code> property of <code>page_action</code>
           can no longer be specified as an object. It must be a string.
         </p>
       </li>
-      <li>
-        <p>
-          The <code>chrome.self</code> API has been removed. Use
-          <a href="extension.html"><code>chrome.extension</code></a> instead.
-        </p>
-      </li>
     </ul>
   </li>
   <li>
     <p>
+      The <code>chrome.self</code> API has been removed. Use
+      <a href="extension.html"><code>chrome.extension</code></a> instead.
+    </p>
+  </li>
+  <li>
+    <p>
       <code>chrome.extension.getTabContentses</code> (!!!) and
       <code>chrome.extension.getExtensionTabs</code> are gone. Use
       $ref:extension.getViews instead.
     </p>
   </li>
   <li>
     <p>
       <code>Port.tab</code> is gone. Use
       $ref:runtime.Port
       instead.
     </p>
   </li>
 </ul>