Fix checkstyle violations in samples

spring-boot-samples/spring-boot-sample-web-ui/src/main/java/sample/web/ui/mvc/MessageController.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -31,10 +31,6 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.servlet.ModelAndView;
 import org.springframework.web.servlet.mvc.support.RedirectAttributes;
 
-/**
- * @author Rob Winch
- * @author Doo-Hwan Kwak
- */
 @Controller
 @RequestMapping("/")
 public class MessageController {
@@ -77,14 +73,14 @@ public class MessageController {
 		throw new RuntimeException("Expected exception in controller");
 	}
 
-	@GetMapping(value = "delete/{id}")
+	@GetMapping("delete/{id}")
 	public ModelAndView delete(@PathVariable("id") Long id) {
 		this.messageRepository.deleteMessage(id);
 		Iterable<Message> messages = this.messageRepository.findAll();
 		return new ModelAndView("messages/list", "messages", messages);
 	}
 
-	@GetMapping(value = "modify/{id}")
+	@GetMapping("modify/{id}")
 	public ModelAndView modifyForm(@PathVariable("id") Message message) {
 		return new ModelAndView("messages/form", "message", message);
 	}