docs(pubsub): Fix region tags for Pub/Sub ingestion from GCS samples (#…

…14773)

google/cloud/pubsub/samples/topic_admin_samples.cc

@@ -215,7 +215,7 @@ void CreateTopicWithKinesisIngestion(
 void CreateTopicWithCloudStorageIngestion(
     google::cloud::pubsub_admin::TopicAdminClient client,
     std::vector<std::string> const& argv) {
-  //! [pubsub_create_topic_with_cloud_storage_ingestion]
+  // [START pubsub_create_topic_with_cloud_storage_ingestion]
   namespace pubsub = ::google::cloud::pubsub;
   namespace pubsub_admin = ::google::cloud::pubsub_admin;
   [](pubsub_admin::TopicAdminClient client, std::string project_id,
@@ -267,7 +267,7 @@ void CreateTopicWithCloudStorageIngestion(
     std::cout << "The topic was successfully created: " << topic->DebugString()
               << "\n";
   }
-  //! [pubsub_create_topic_with_cloud_storage_ingestion]
+  // [END pubsub_create_topic_with_cloud_storage_ingestion]
   (std::move(client), argv.at(0), argv.at(1), argv.at(2), argv.at(3),
    argv.at(4), argv.at(5), argv.at(6));
 }