Fix docs for batch error handler

Author: garyrussell

src/reference/asciidoc/kafka.adoc

@@ -2998,7 +2998,7 @@ public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<Integer,
     ConcurrentKafkaListenerContainerFactory<Integer, String> factory =
             new ConcurrentKafkaListenerContainerFactory<>();
     ...
-    factory.getContainerProperties().setBatchErrorHandler(myBatchErrorHandler);
+    factory.setBatchErrorHandler(myBatchErrorHandler);
     ...
     return factory;
 }