Cleanup pass.

chrome/common/extensions/docs/static/packaging.html

 <div id="pageData-name" class="pageData">Packaging</div>
 <div id="pageData-showTOC" class="pageData">true</div>
 
 <p>
 This page describes how to package your extension.
 As the <a href="overview.html">Overview</a> explains,
 extensions are packaged as signed ZIP files
 with the file extension "crx" &mdash;
 for example, <code>myextension.crx</code>.
 </p>
@@ skipping 25 matching lines @@
 <ol>
   <li>
     Bring up the Extensions management page
     by going to this URL:
     <blockquote>
     <b>chrome://extensions</b>
     </blockquote>
   </li>
 
   <li>
+    If <b>Developer mode</b> has a + by it,
+    click the +.
+  </li>
+
+  <li>
     Click the <b>Pack extension</b> button.
     A dialog appears.
   </li>
 
   <li>
     In the <b>Extension root directory</b> field,
     specify the path to the extension's folder &mdash;
     for example, <code>c:\myext</code>.
     (Ignore the other field;
     you don't specify a private key file
@@ skipping 98 matching lines @@
 
 <p>
 You can also use a Ruby script to create packages.
 See the following page for details:
 </p>
 
 <blockquote>
 <a href="http://github.com/Constellation/crxmake">github: crxmake</a>