'Fetch a DocumentInstance
:returns: Fetched DocumentInstance
:rtype: twilio.rest.sync.v1.service.document.DocumentInstance'

def fetch(self):

    params = values.of({})
    payload = self._version.fetch('GET', self._uri, params=params)
    return DocumentInstance(self._version, payload, service_sid=self._solution['service_sid'], sid=self._solution['sid'])
