Fixed #18696 - Clarified WizardView heading; thanks sergzach.

docs/ref/contrib/formtools/form-wizard.txt

@@ -86,8 +86,8 @@ the message itself. Here's what the :file:`forms.py` might look like::
     section :ref:`Handling files <wizard-files>` below to learn more about
     what to do.
 
-Creating a ``WizardView`` class
--------------------------------
+Creating a ``WizardView`` subclass
+----------------------------------
 
 The next step is to create a
 :class:`django.contrib.formtools.wizard.views.WizardView` subclass. You can