[1.0.X] Fixed #9412 -- Corrected a couple of typos in the custom model field doc. Thanks carljm.

You only need to override this method if you want to preprocess the value

somehow, just before saving. For example, Django's

`:class:`~django.db.models.DateTimeField` uses this method to set the attribute

:class:`~django.db.models.DateTimeField` uses this method to set the attribute

correctly in the case of :attr:`~django.db.models.Field.auto_now` or

:attr:`~django.db.models.Field.auto_now_add`.

.. method:: value_to_string(self, obj)

This method is used by the serializers to convert the field into a string for

output. Calling :meth:``Field._get_val_from_obj(obj)`` is the best way to get the

output. Calling :meth:`Field._get_val_from_obj(obj)` is the best way to get the

value to serialize. For example, since our ``HandField`` uses strings for its

data storage anyway, we can reuse some existing conversion code::