Fix up docs.

templates/Pages/best_practices.php

@@ -90,7 +90,7 @@
 	...
 ],
 </code></pre>
-<p>Another very useful addition is to log 404s separately from actual (internal) errors happening using <a href="https://github.com/dereuromark/cakephp-tools/blob/master/docs/Error/ExcpetionTrap.md.md">Tools.ExcpetionTrap</a>.</p>
+<p>Another very useful addition is to log 404s separately from actual (internal) errors happening using <a href="https://github.com/dereuromark/cakephp-tools/blob/master/docs/Error/ExceptionTrap.md">Tools.ExceptionTrap</a>.</p>
 
 <h3>Use AJAX wisely</h3>
 <p>