message: Fixes 179: Adds missing return statement in docs
  Fixes
  Added a missing return statement. This change should propagate to the auto-generated docs page.
diff: @@ -547,6 +547,8 @@ Topic.prototype.getSubscriptionsStream = common.paginator.streamify(
  * @param {number} [options.batching.maxMilliseconds] The maximum duration to
  * wait before sending a payload.
  *
  + * @return {Publisher}
  + *
  * @example
  * const PubSub = require('@google-cloud/pubsub');
  * const pubsub = new PubSub();
  