sample data include edit

Author: norareidy

source/includes/use-sample-data.rst

@@ -1,5 +1,7 @@
-The |model-classes| an inner ``Meta`` class and a ``__str__()`` method.
-To learn about these model features, see :ref:`django-models-define` in the
+The |model-classes| an inner ``Meta`` class, which specifies
+model metadata, and a ``__str__()`` method, which sets the 
+model's string representation to its ``title`` field. To learn about
+these model features, see :ref:`django-models-define` in the
 Create Models guide.
 
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