Remove .html extension from links

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

 <meta name="doc-family" content="apps">
 <h1>Chrome App Lifecycle</h1>
 
 
 <p>
 The app runtime and event page are responsible
 for managing the app lifecycle.
 The app runtime manages app installation,
 controls the event page,
 and can shutdown the app at anytime.
@@ skipping 129 matching lines @@
 
 <h3 id="local_settings">Storing local settings</h3>
 
 <p>
 <code>chrome.runtime.onInstalled()</code>
 is called when your app has first been installed,
 or when it has been updated.
 Any time this function is called,
 the <code>onInstalled</code> event is fired.
 The event page can listen for this event and use the
-<a href="storage.html">Storage API</a>
+<a href="storage">Storage API</a>
 to store and update local settings
-(see also <a href="app_storage.html#options">Storage options</a>).
+(see also <a href="app_storage#options">Storage options</a>).
 </p>
 
 <pre data-filename="background.js">
 chrome.runtime.onInstalled.addListener(function() {
   chrome.storage.local.set(object items, function callback);
 });
 </pre>
 
 <h3 id="preventing_loss">Preventing data loss</h3>
 
@@ skipping 37 matching lines @@
 Keep the clean-up tasks synchronous and simple.
 </p>
 
 <pre data-filename="background.js">
 chrome.runtime.onSuspend.addListener(function() {
   // Do some simple clean-up tasks.
 });
 </pre>
 
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