message: docs: remove stale example
diff: @@ -201,17 +201,6 @@ function PubSub(options) {
  *
  * pubsub.createSubscription(topic, name, callback);
  *
  - * @example <caption>Customize the subscription.</caption>
  - * const PubSub = require('@google-cloud/pubsub');
  - * const pubsub = new PubSub();
  - *
  - * const topic = 'messageCenter';
  - * const name = 'newMessages';
  - *
  - * pubsub.createSubscription(topic, name, {
  - * ackDeadline: 90000 // 90 seconds
  - * }, callback);
  - *
  * @example <caption>If the callback is omitted, we'll return a Promise.</caption>
  * pubsub.createSubscription(topic, name).then(function(data) {
  * const subscription = data[0];
  