Addressing PR review.

Signed-off-by: Sanghyeok An <[email protected]>

Author: chickenchickenlove

spring-kafka-docs/src/main/antora/modules/ROOT/pages/kafka/receiving-messages/message-listener-container.adoc

@@ -31,13 +31,18 @@ The following example shows how to do so:
 public void configureRecordInterceptor(KafkaMessageListenerContainer<Integer, String> container) {
     CompositeRecordInterceptor compositeInterceptor;
 
-    if (container.getRecordInterceptor() instanceof CompositeRecordInterceptor interceptor) {
+    RecordInterceptor<Integer, String> previousInterceptor = container.getRecordInterceptor();
+    if (previousInterceptor instanceof CompositeRecordInterceptor interceptor) {
         compositeInterceptor = interceptor;
     } else {
         compositeInterceptor = new CompositeRecordInterceptor<>();
         container.setRecordInterceptor(compositeInterceptor);
     }
 
+    if (previousInterceptor != null) {
+        compositeRecordInterceptor.addRecordInterceptor(previousInterceptor);
+    }
+
     RecordInterceptor<Integer, String> recordInterceptor1 = new RecordInterceptor() {...};
     RecordInterceptor<Integer, String> recordInterceptor2 = new RecordInterceptor() {...};