Minor typo in class name

doc/tags/extends.rst

@@ -153,7 +153,7 @@ Twig supports dynamic inheritance by using a variable as the base template:
 
     {% extends some_var %}
 
-If the variable evaluates to a ``Twig_Template`` or a ``Twig_TemplateWraper``
+If the variable evaluates to a ``Twig_Template`` or a ``Twig_TemplateWrapper``
 instance, Twig will use it as the parent template::
 
     // {% extends layout %}