Remove .html extension from links

chrome/common/extensions/docs/templates/articles/a11y.html

 <h1>Accessibility (a11y)</h1>
 
 
 <p>
 When you design an extension,
 try to make it as accessible as possible
 to people with disabilities such as
 visual impairment, hearing loss, and limited dexterity.
 </p>
 
@@ skipping 285 matching lines @@
 <a href="http://dev.aol.com/dhtml_style_guide">guidelines for keyboard shortcuts</a>.
 </p>
 
 <p>
 A good way to ensure discoverability of keyboard shortcuts
 is to list them somewhere.
 {{?is_apps}}
   Your application's options page
 {{:is_apps}}
   Your extension's
-  <a href="options.html">Options page</a>
+  <a href="options">Options page</a>
 {{/is_apps}}
 might be a good place to do this.
 </p>
 
 <p>
 For the example toolbar,
 a simple JavaScript keyboard handler could look like the following.
 Note how the ARIA property <code>aria-activedescendant</code>
 is updated in response to user input
 to reflect the current active toolbar button.
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 Text styled in a web font is searchable,
 scales to different sizes,
 and is accessible to people using screen readers.
 </p>
 
 <h3 id="colors">Colors</h3>
 
 <p>
 Check that there is sufficient contrast between
 background color and foreground/text color in your extension.
-<a href="http://snook.ca/technical/colour_contrast/colour.html">This contrast checking tool</a>
+<a href="http://snook.ca/technical/colour_contrast/colour">This contrast checking tool</a>
 checks whether your background and foreground colors
 provide appropriate contrast.
 If you’re developing in a Windows environment,
 you can also enable High Contrast Mode
 to check the contrast of your extension.
 When evaluating contrast,
 verify that every part of your extension that relies on
 color or graphics to convey information is clearly visible.
 For specific images, you can use a tool such as the
 <a href="http://www.vischeck.com/vischeck/">Vischeck simulation tool</a>
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 <a href="http://www.webaim.org/techniques/alttext/">WebAIM article on appropriate alt text</a>.
 
 <h2 id="examples">Examples</h2>
 
 <p>
 For an example that implements keyboard navigation and ARIA properties, see
 <a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/extensions/news_a11y/">examples/extensions/news_a11y</a>
 (compare it to
 <a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/extensions/news/">examples/extensions/news</a>).
 For more examples and for help in viewing the source code,
-see <a href="samples.html">Samples</a>.
+see <a href="samples">Samples</a>.