docs: Fix some broken links to samples where the #hash-word is supposed to be a search term.

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

 <h1 class="page_title">chrome.experimental.* APIs</h1>
 
 <h2 id="overview">
 List of APIs
 </h2>
 
 {{^is_apps}}
 <p class="doc-family extensions">
 We'd like your <a href="http://groups.google.com/a/chromium.org/group/chromium-extensions/topics">feedback</a>
 on the following experimental APIs:
 </p>
 {{/is_apps}}
 
 {{+partials.api_table apis:apis is_stable:false/}}
 
 {{^is_apps}}
 <p class="doc-family extensions">
 Pay special attention to the following APIs,
 which we expect to finalize soon:
 <b>devtools</b>,
 <b>permissions</b>,
 For examples of using the experimental APIs, see
-<a href="samples#experimental">Samples</a>.
+<a href="samples#search:experimental">Samples</a>.
 </p>
 {{/is_apps}}
 
 <p class="warning">
 <b>Caution:</b>
 Don't depend on these experimental APIs.
 They might disappear,
 and they <em>will</em> change.
 Also, the Chrome Web Store doesn't allow you to
 upload items that use experimental APIs.
@@ skipping 59 matching lines @@
   {{/is_apps}}
 </ol>
 
 <h2 id="other">More APIs</h2>
 
 <p>
 For information on the standard APIs, see
 <a href="api_index">chrome.* APIs</a> and
 <a href="api_other">Other APIs</a>.
 </p>