GH-2516: Fix code example for Non-Blocking Retries

Resolves #2516

Fixes GH-2516

Fixes GH-2516

Fix copyright.

Author: jucosorin

spring-kafka-docs/src/main/asciidoc/retrytopic.adoc

@@ -840,7 +840,7 @@ The framework provides a few strategies for working with DLTs. You can provide a
 
 ===== Dlt Processing Method
 
-You can specify the method used to process the Dlt for the topic, as well as the behavior if that processing fails.
+You can specify the method used to process the DLT for the topic, as well as the behavior if that processing fails.
 
 To do that you can use the `@DltHandler` annotation in a method of the class with the `@RetryableTopic` annotation(s).
 Note that the same method will be used for all the `@RetryableTopic` annotated methods within that class.
@@ -870,7 +870,7 @@ The DLT handler method can also be provided through the RetryTopicConfigurationB
 public RetryTopicConfiguration myRetryTopic(KafkaTemplate<Integer, MyPojo> template) {
     return RetryTopicConfigurationBuilder
             .newInstance()
-            .dltProcessor("myCustomDltProcessor", "processDltMessage")
+            .dltHandlerMethod("myCustomDltProcessor", "processDltMessage")
             .create(template);
 }
 
@@ -923,7 +923,7 @@ public void processMessage(MyPojo message) {
 public RetryTopicConfiguration myRetryTopic(KafkaTemplate<Integer, MyPojo> template) {
     return RetryTopicConfigurationBuilder
             .newInstance()
-            .dltProcessor(MyCustomDltProcessor.class, "processDltMessage")
+            .dltHandlerMethod("myCustomDltProcessor", "processDltMessage")
             .doNotRetryOnDltFailure()
             .create(template);
 }

spring-kafka/src/main/java/org/springframework/kafka/retrytopic/RetryTopicConfigurer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2022 the original author or authors.
+ * Copyright 2018-2023 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.
@@ -178,7 +178,7 @@
  *     public RetryTopicConfiguration otherRetryTopic(KafkaTemplate<Integer, MyPojo> template) {
  *         return RetryTopicConfigurationBuilder
  *                 .newInstance()
- *                 .dltProcessor(MyCustomDltProcessor.class, "processDltMessage")
+ *                 .dltHandlerMethod("myCustomDltProcessor", "processDltMessage")
  *                 .create(template);
  *     }</code>
  *