[docs] better links in devtools api docs

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

 <h1>Extending DevTools</h1>
 
 <h2 id="overview">Overview</h2>
 
 <p>A DevTools extension adds functionality to the Chrome DevTools. It can add new
 UI panels and sidebars, interact with the inspected page, get information about
-network requests, and more. DevTools extensions have access to an additional set
+network requests, and more. View <a href="https://developer.chrome.com/devtools/docs/extensions-gallery">featured DevTools extensions</a>. DevTools extensions have access to an additional set
 of DevTools-specific extension APIs:</p>
 
 <ul>
 <li><code>$(ref:devtools.inspectedWindow)</code></li>
 <li><code>$(ref:devtools.network)</code></a></li>
 <li><code>$(ref:devtools.panels)</code></a></li>
 </ul>
 
 <p>A DevTools extension is structured like any other extension: it can have a
 background page, content scripts, and other items. In addition, each DevTools
@@ skipping 381 matching lines @@
   // Only accept messages that we know are ours
   if (typeof message !== 'object' || message === null ||
       !message.source === 'my-devtools-extension') {
     return;
   }
 
   chrome.runtime.sendMessage(message);
 });
 </pre>
 
-Your message will now flow from the injected script, to the content script, to
-the background script, and finally to the DevTools page.
+<p>Your message will now flow from the injected script, to the content script, to
+the background script, and finally to the DevTools page.</p>
+
+<p>You can also consider <a href="https://github.com/GoogleChrome/devtools-docs/issues/143">two alternative message passing techniques here</a>.</p>
+
 
 <h3 id="detecting-open-close">Detecting When DevTools Opens and Closes</h3>
 
 <p>If your extension needs to track whether the DevTools window is open, you can
 add an $(ref:runtime.onConnect onConnect) listener to the background page, and call
 $(ref:runtime.connect connect) from the DevTools page. Since each tab can have its
 own DevTools window open, you may receive multiple connect events. To track whether
 any DevTools window is open, you need to count the connect and disconnect events as
 shown below:</p>
 
@@ skipping 36 matching lines @@
 <p>
 <a href="http://groups.google.com/group/google-chrome-developer-tools/topics">Give
 us feedback!</a>
 Your comments and suggestions help us improve the APIs.</p>
 
 <h2 id="examples">Examples</h2>
 
 <p>You can find examples that use DevTools APIs in
 <a href="http://developer.chrome.com/extensions/samples.html#devtools">Samples</a>.
 </p>