fix rocketmq example code style.

spring-cloud-alibaba-examples/rocketmq-example/rocketmq-delay-consume-example/src/main/java/com/alibaba/cloud/examples/delay/RocketMQDelayConsumeApplication.java

@@ -48,8 +48,7 @@ public class RocketMQDelayConsumeApplication {
 	}
 
 	/**
-	 * Produce delay messages
-	 * @return
+	 * Produce delay messages.
 	 */
 	@Bean
 	public ApplicationRunner producerDelay() {

spring-cloud-alibaba-examples/rocketmq-example/rocketmq-orderly-consume-example/src/main/java/com/alibaba/cloud/examples/orderly/OrderlyMessageQueueSelector.java

@@ -38,11 +38,11 @@ public class OrderlyMessageQueueSelector implements MessageQueueSelector {
 			.getLogger(OrderlyMessageQueueSelector.class);
 
 	/**
-	 * to select a fixed queue by id
-	 * @param mqs
-	 * @param msg
-	 * @param arg
-	 * @return
+	 * to select a fixed queue by id.
+	 * @param mqs all message queues of this topic.
+	 * @param msg mq message.
+	 * @param arg mq arguments.
+	 * @return message queue selected.
 	 */
 	@Override
 	public MessageQueue select(List<MessageQueue> mqs, Message msg, Object arg) {