      Every built in view which needs context data, such as for rendering a
      template (including ``TemplateResponseMixin`` above), should call
      :meth:`~django.views.generic.base.ContextMixin.get_context_data` passing
      any data they want to ensure is in there as keyword arguments.
      ``get_context_data`` returns a dictionary; in ``ContextMixin`` it
      simply returns its keyword arguments, but it is common to override this to
      add more members to the dictionary.
  
  Building up Django's generic class-based views
  ==============================================
 
</s> remove     :meth:`~django.views.generic.base.ContextMixin.get_context_data` passing
 </s> add     :meth:`~django.views.generic.base.ContextMixin.get_context_data()` passing </s> remove :meth:`~django.views.generic.base.ContextMixin.get_context_data`,
 </s> add :meth:`~django.views.generic.base.ContextMixin.get_context_data()`, </s> remove     :meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response`
 </s> add     :meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response()` </s> remove :meth:`~django.views.generic.base.ContextMixin.get_context_data` to
 </s> add :meth:`~django.views.generic.base.ContextMixin.get_context_data()` to </s> remove This mixin provides a ``render_to_json_response`` method with the same signature
 </s> add This mixin provides a ``render_to_json_response()`` method with the same signature
    ``get_context_data()`` returns a dictionary; in ``ContextMixin`` it
      Every built in view which needs context data, such as for rendering a
      template (including ``TemplateResponseMixin`` above), should call
      :meth:`~django.views.generic.base.ContextMixin.get_context_data` passing
      any data they want to ensure is in there as keyword arguments.
    ``get_context_data()`` returns a dictionary; in ``ContextMixin`` it
      simply returns its keyword arguments, but it is common to override this to
      add more members to the dictionary.
  
  Building up Django's generic class-based views
  ==============================================
keep keep keep keep replace keep keep keep keep keep
 Fixed #20658 -- Fixed bad reST formatting and missing parentheses in the docs for CBV mixins

Thanks to Keryn Knight for the report. 
docs/topics/class-based-views/mixins.txt