Remove .html extension from links

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

 <h1>Connect Apps with Web Intents</h1>
 
 <p class="warning">
 <b>Warning: </b>
 Deprecated in Chrome 24.
 Web intents are no longer supported.
 </p>
 
 <p>
 <a href="http://webintents.org/">Web Intents</a>
@@ skipping 180 matching lines @@
 
 <p class="warning">
 <b>Warning: </b>
 Deprecated in Chrome 24.
 Web intents are no longer supported.
 </p>
 
 <p>
 If your application or extension is localized
 as per the guidelines in
-<a href="i18n.html">Internationalization (i18n)</a>,
+<a href="i18n">Internationalization (i18n)</a>,
 you can localize the title of your intent in the picker
 using the exact same infrastructure:
 </p>
 
 <pre data-filename="manifest.json">
 "intents": {
  "http://webintents.org/edit" : [{
    "title" : "__MSG_intent_title__",
    "type" : ["image/*"],
    "disposition" : "inline"
@@ skipping 60 matching lines @@
   console.log(intent.action);
   console.log(intent.type);
   var data = intent.data;
   // Do something with the data;
 
   intent.postResult(newData);
 });
 </pre>
 
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