code: def update_feed(self, feed, feed_id):
          
          route_values = {}
          if feed_id is not None:
              route_values['feedId'] = self._serialize.url('feed_id', feed_id, 'str')
          content = self._serialize.body(feed, 'FeedUpdate')
          response = self._send(http_method='PATCH',
                                location_id='c65009a7-474a-4ad1-8b42-7d852107ef8c',
                                version='5.0-preview.1',
                                route_values=route_values,
                                content=content)
          return self._deserialize('Feed', response)
docs: UpdateFeed.
          [Preview API] Change the attributes of a feed.
          :param :class:`<FeedUpdate> <azure.devops.v5_0.feed.models.FeedUpdate>` feed: A JSON object containing the feed settings to be updated.
          :param str feed_id: Name or Id of the feed.
          :rtype: :class:`<Feed> <azure.devops.v5_0.feed.models.Feed>`