VIEW_DESCRIPTION_FUNCTION is only effective for class docstrings, not method docstrings

[jpmckinney]

See

django-rest-framework/rest_framework/schemas/inspectors.py

Lines 72 to 88 in 71e6c30

	def get_description(self, path, method):
	"""
	Determine a path description.
	This will be based on the method docstring if one exists,
	or else the class docstring.
	"""
	view = self.view
	method_name = getattr(view, 'action', method.lower())
	method_docstring = getattr(view, method_name, None).__doc__
	if method_docstring:
	# An explicit docstring on the method or action.
	return self._get_description_section(view, method.lower(), formatting.dedent(smart_str(method_docstring)))
	else:
	return self._get_description_section(view, getattr(view, 'action', method.lower()),
	view.get_view_description())

I just wanted to be able to use reStructuredText for my method docstrings (like I do for everything else, since I use Sphinx, where RST is the default), and to have them rendered properly both in my docs and in the Swagger UI.