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

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

 <p>Use browser actions to put icons
   in the main Google Chrome toolbar,
   to the right of the address bar.
   In addition to its <a href="#icon">icon</a>,
   a browser action can also have
   a <a href="#tooltip">tooltip</a>,
   a <a href="#badge">badge</a>,
   and a <a href="#popups">popup</a>.
   </p>
 
@@ skipping 153 matching lines @@
   <li><b>Do</b> use browser actions for features
     that make sense on most pages.
   <li><b>Don't</b> use browser actions for features
     that make sense for only a few pages.
     Use <a href="pageAction.html">page actions</a> instead.
   <li><b>Do</b> use big, colorful icons that make the most of
     the 19x19-pixel space.
     Browser action icons should seem a little bigger
     and heavier than page action icons.
   <li><b>Don't</b> attempt to mimic
-    Google Chrome's monochrome "wrench" icon.
+    Google Chrome's monochrome Chrome menu icon.

[not at google - send to devlin, 2013/02/11 14:06:46]

just "menu"

[方觉(Fang Jue), 2013/02/12 03:27:14]

Done.

     That doesn't work well with themes, and anyway,
     extensions should stand out a little.
   <li><b>Do</b> use alpha transparency
     to add soft edges to your icon.
     Because many people use themes,
     your icon should look nice
     on a variety of background colors.
   <li><b>Don't</b> constantly animate your icon.
     That's just annoying.
 </ul>
 
 <h2 id="examples"> Examples </h2>
 
 <p>
 You can find simple examples of using browser actions in the
 <a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/api/browserAction/">examples/api/browserAction</a>
 directory.
 For other examples and for help in viewing the source code, see
 <a href="samples.html">Samples</a>.
 </p>