https://github.com/GoogleCloudPlatform/gcloud-ruby/blob/v0.11.0/lib/gcloud/pubsub/topic.rb#L94-L141

The example says we can leave out the name and get a generated name, but the method requires a name.

It's also not a good example, since we give name my-topic-sub and get name generated-sub-name