[1.7.x] Fixed #22372 -- Improved description of WizardView.get_context_data().

Thanks simon29 for the report.

Backport of a8e2ec0e from master

django/contrib/formtools/wizard/views.py

@@ -538,8 +538,7 @@ class WizardView(TemplateView):
         context variables are:
 
          * all extra data stored in the storage backend
-         * `form` - form instance of the current step
-         * `wizard` - the wizard instance itself
+         * `wizard` - a dictionary representation of the wizard instance
 
         Example:
 

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

@@ -405,8 +405,13 @@ Advanced ``WizardView`` methods
     The default template context variables are:
 
     * Any extra data the storage backend has stored
-    * ``form`` -- form instance of the current step
-    * ``wizard`` -- the wizard instance itself
+    * ``wizard`` -- a dictionary representation of the wizard instance with the
+      following key/values:
+
+      * ``form`` -- :class:`~django.forms.Form` or
+        :class:`~django.forms.formsets.BaseFormSet` instance for the current step
+      * ``steps`` -- A helper object to access the various steps related data
+      * ``management_form`` -- all the management data for the current step
 
     Example to add extra variables for a specific step::