Fix What's New for the proper link to Kafka chapter

src/reference/asciidoc/whats-new.adoc

@@ -18,13 +18,12 @@ If you are interested in more details, see the Issue Tracker tickets that were r
 [[x5.4-sik]]
 ==== Apache Kafka Channel Adapters
 The standalone https://projects.spring.io/spring-integration-kafka/[Spring Integration Kafka] project has been merged as a `spring-integration-kafka` module to this project.
-See <<./kafka.adoc#kafka,Spring for Apache Kafka Support>> for more information.
 
 The `KafkaProducerMessageHandler` `sendTimeoutExpression` default has changed.
-See <<./kafka.adoc#kafka-outbound,Kafka Outbound Channel Adapter>> for more information.
 
 You can now access the `Future<?>` for underlying `send()` operations.
-See <<./kafka.adoc#read-process-write>> for more information.
+
+See <<./kafka.adoc#kafka,Spring for Apache Kafka Support>> for more information.
 
 [[x5.4-r2dbc]]
 ==== R2DBC Channel Adapters