Update the display name of a device.

        Args:
            device_id (str): The device ID of the device to update.
            display_name (str): New display name for the device.

def update_device_info(self, device_id, display_name):
        """Update the display name of a device.

        Args:
            device_id (str): The device ID of the device to update.
            display_name (str): New display name for the device.
        """
        content = {
            "display_name": display_name
        }
        return self._send("PUT", "/devices/%s" % device_id, content=content)