Merge 159156 - Extensions Docs Server: Fix headings with no IDs

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

 <p>
 Use <code>chrome.devtools.inspectedWindow</code>
 to interact with the inspected window:
 obtain the tab ID for the inspected page,
 evaluate the code in the context of inspected window,
 reload the page,
 or obtain the list of resources within the page.
 </p><p>
 See <a href="devtools.html">DevTools APIs summary</a> for
 general introduction to using Developer Tools APIs.
 </p>
 
-<h2>Overview</h2>
+<h2 id="overview">Overview</h2>
 <p>
 The <a href="#property-tabId"><code>tabId</code></a> property
 provides the tab identifier that you can use with the
 <a href="tabs.html"><code>chrome.tabs.*</code></a> API calls.
 However, please note that <code>chrome.tabs.*</code> API is not
 exposed to the Developer Tools extension pages due to security considerations
 &mdash; you will need to pass the tab ID to the background page and invoke
 the <code>chrome.tabs.*</code> API functions from there.
 </p>
 <p>
@@ skipping 63 matching lines @@
          console.log("the page is not using jQuery");
        else
          console.log("The page is using jQuery v" + result);
      }
 );
 </pre>
 
 <p>
 You can find more examples that use Developer Tools APIs in
 <a href="samples.html#devtools">Samples</a>.
-</p>
+</p>