chore(kafka-example): fix operation description

Co-authored-by: Timon Back <timonback@users.noreply.github.com>

springwolf-examples/springwolf-kafka-example/src/main/java/io/github/stavshamir/springwolf/example/kafka/consumers/YamlConsumer.java

@@ -20,7 +20,7 @@ public class YamlConsumer {
             operation =
                     @AsyncOperation(
                             channelName = "yaml-topic",
-                            description = "Showcases a xml based message",
+                            description = "Showcases a yaml based message",
                             message = @AsyncMessage(contentType = "application/yaml")))
     @KafkaAsyncOperationBinding
     @KafkaListener(topics = "yaml-topic")