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

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

 <p id="classSummary">
 Use the <code>chrome.experimental.devtools.audits</code> module to add new audit
 categories to Developer Tools' Audit panel.
 </p><p>
 See <a href="experimental.devtools.html">DevTools APIs summary</a> for
 general introduction to using Developer Tools APIs</a>.
 </p>
 
-<h2>Overview</h2>
+<h2 id="overview">Overview</h2>
 
 <p>
 Each audit category is represented by a line on <em>Select audits to run</em>
 screen in the Audits panel. The following example adds a category named
 <em>Readability</em>:</p>
 <pre>
 var category = chrome.experimental.devtools.audits.addCategory("Readability", 2);
 </pre>
 <img src="{{static}}/images/devtools-audits-category.png"
      style="margin-left: 20px"
@@ skipping 12 matching lines @@
 calls AuditResult's <code>done()</code> method.
 </p>
 <p>The results may include additional details visualized as an expandable
 tree by the Audits panel. You may build the details tree using the
 <code>createResult()</code> and <code>addChild()</code> methods. The child node
 may include specially formatted fragments created by the
 <code>auditResults.createSnippet()</code>
 and <code>auditResults.createURL()</code> methods.
 </p>
 
-<h2>Examples</h2>
+<h2 id="examples">Examples</h2>
 <p>The following example adds a handler for onAuditStarted event that creates
 two audit results and populates one of them with the additional details:
 </p>
 
 <pre>
 category.onAuditStarted.addListener(function(results) {
   var details = results.createResult("Details...");
   var styles = details.addChild("2 styles with small font");
   var elements = details.addChild("3 elements with small font");
 
   results.addResult("Font Size (5)",
       "5 elements use font size below 10pt",
       results.Severity.Severe,
       details);
   results.addResult("Contrast",
                     "Text should stand out from background",
                     results.Severity.Info);
 });
 </pre>
 <p>The audit result tree produced by the snippet above will look like this:
 </p>
 <img src="{{static}}/images/devtools-audits-results.png"
      style="margin-left: 20px"
      width="330" height="169"
      alt="Audit results example" />
 
 <p>
 You can find more examples that use this API in
 <a href="samples.html#devtools.audits">Samples</a>.
-</p>
+</p>