code: def set_feed_permissions(self, feed_permission, 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_permission, '[FeedPermission]')
          response = self._send(http_method='PATCH',
                                location_id='be8c1476-86a7-44ed-b19d-aec0e9275cd8',
                                version='5.1-preview.1',
                                route_values=route_values,
                                content=content)
          return self._deserialize('[FeedPermission]', self._unwrap_collection(response))
docs: SetFeedPermissions.
          [Preview API] Update the permissions on a feed.
          :param [FeedPermission] feed_permission: Permissions to set.
          :param str feed_id: Name or Id of the feed.
          :rtype: [FeedPermission]