Reduce warnings reported by Eclipse

Closes gh-41598

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/messaging/pulsar/readingreactive/MyBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023-2023 the original author or authors.
+ * Copyright 2023-2024 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.
@@ -37,6 +37,7 @@ public class MyBean {
 		this.pulsarReaderFactory = pulsarReaderFactory;
 	}
 
+	@SuppressWarnings("unused")
 	public void someMethod() {
 		ReactiveMessageReaderBuilderCustomizer<String> readerBuilderCustomizer = (readerBuilder) -> readerBuilder
 			.topic("someTopic")