Remove .html extension from links

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

 <h2 id="manifest">Manifest</h2>
 <p>To use the Font Settings API, you must declare the "fontSettings" permission
-in the <a href="manifest.html">extension manifest</a>.
+in the <a href="manifest">extension manifest</a>.
 For example:</p>
 <pre data-filename="manifest.json">
 {
   "name": "My Font Settings Extension",
   "description": "Customize your fonts",
   "version": "0.2",
   <b>"permissions": [
     "fontSettings"
   ]</b>,
   ...
 }
 </pre>
 
 <h2 id="scripts">Generic Font Families and Scripts</h2>
 <p>Chrome allows for some font settings to depend on certain generic font
 families and language scripts. For example, the font used for sans-serif
 Simplified Chinese may be different than the font used for serif Japanese.</p>
 
 <p>The generic font families supported by Chrome are based on
-<a href="http://www.w3.org/TR/CSS21/fonts.html#generic-font-families">CSS generic font families</a>
+<a href="http://www.w3.org/TR/CSS21/fonts#generic-font-families">CSS generic font families</a>
 and are listed in the API reference below. When a webpage specifies a generic
 font family, Chrome selects the font based on the corresponding setting. If no
 generic font family is specified, Chrome uses the setting for the "standard"
 generic font family.</p>
 
 <p>When a webpage specifies a language, Chrome selects the font based on the
 setting for the corresponding language script. If no language is specified,
 Chrome uses the setting for the default, or global, script.</p>
 
 <p>The supported language scripts are specified by ISO 15924 script code and
@@ skipping 15 matching lines @@
 <p>The next snippet sets the sans-serif font for Japanese.</p>
 <pre>
 chrome.fontSettings.setFont(
   { genericFamily: 'sansserif', script: 'Jpan', fontId: 'MS PGothic' }
 );
 </pre>
 
 <p>You can find a sample extension using the Font Settings API in the
 <a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/api/fontSettings/">examples/api/fontSettings</a>
 directory. For other examples and for help in viewing the source code, see
-<a href="samples.html">Samples</a>.</p>
+<a href="samples">Samples</a>.</p>