Fixed #14023 -- include non_field_errors in example. Thanks to konryd for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14041 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/topics/forms/index.txt

@@ -210,6 +210,7 @@ the way a form is presented using the Django template language. Extending the
 above example::
 
     <form action="/contact/" method="post">
+        {{ form.non_field_errors }}
         <div class="fieldWrapper">
             {{ form.subject.errors }}
             <label for="id_subject">E-mail subject:</label>