Fixing typos

lib/Twig/Extension/Debug.php

@@ -17,7 +17,7 @@ class Twig_Extension_Debug extends Twig_Extension
      */
     public function getFunctions()
     {
-        // dump is safe if var_dump is overriden by xdebug
+        // dump is safe if var_dump is overridden by xdebug
         $isDumpOutputHtmlSafe = extension_loaded('xdebug')
             // false means that it was not set (and the default is on) or it explicitly enabled
             && (false === ini_get('xdebug.overload_var_dump') || ini_get('xdebug.overload_var_dump'))

lib/Twig/Template.php

@@ -284,7 +284,7 @@ abstract class Twig_Template implements Twig_TemplateInterface
      * This method is for internal use only and should never be called
      * directly.
      *
-     * This method should not be overriden in a sub-class as this is an
+     * This method should not be overridden in a sub-class as this is an
      * implementation detail that has been introduced to optimize variable
      * access for versions of PHP before 5.4. This is not a way to override
      * the way to get a variable value.