Update Javadoc regarding repeatable annotation support

spring-jms/src/main/java/org/springframework/jms/annotation/JmsListener.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -72,6 +72,9 @@ import org.springframework.messaging.handler.annotation.MessageMapping;
  * {@link org.springframework.messaging.handler.annotation.SendTo @SendTo} to the
  * method declaration.
  *
+ * <p>This annotation can be used as a <em>{@linkplain Repeatable repeatable}</em>
+ * annotation.
+ *
  * <p>This annotation may be used as a <em>meta-annotation</em> to create custom
  * <em>composed annotations</em> with attribute overrides.
  *