Fix the documentation of BoundField.value() to reference the correct method name

	>>> f['message'].css_classes('foo bar')

	'foo bar required'

.. method:: BoundField.values()

.. method:: BoundField.value()

   .. versionadded:: 1.3

    >>> initial = {'subject': 'welcome'}

    >>> unbound_form = ContactForm(initial=initial)

    >>> bound_form = ContactForm(data, initial=initial)

    >>> print unbound_form['subject'].value

    >>> print unbound_form['subject'].value()

    welcome

    >>> print bound_form['subject'].value

    >>> print bound_form['subject'].value()

    hi

.. _binding-uploaded-files: