Small fixes - thanks @bartromgens

docs/guide/rest_framework.txt

@@ -73,8 +73,8 @@ To enable filtering with a ``FilterSet``, add it to the ``filter_class`` paramet
         filter_class = ProductFilter
 
 
-Specifying ``filter_fields``
-----------------------------
+Using the ``filter_fields`` shortcut
+------------------------------------
 
 You may bypass creating a ``FilterSet`` by instead adding ``filter_fields`` to your view class. This is equivalent to creating a FilterSet with just :ref:`Meta.fields <fields>`.
 

docs/guide/usage.txt

@@ -148,7 +148,7 @@ default filters for all the models fields of the same kind using
             models.BooleanField: {
                 'filter_class': django_filters.BooleanFilter,
                 'extra': lambda f: {
-                    'widget': 'forms.CheckboxInput',
+                    'widget': forms.CheckboxInput,
                 },
             },
         }