Polish contribution

See gh-23457

spring-webflux/src/main/java/org/springframework/web/reactive/config/EnableWebFlux.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -34,7 +34,7 @@ import org.springframework.context.annotation.Import;
  * <pre class="code">
  * &#064;Configuration
  * &#064;EnableWebFlux
- * &#064;ComponentScan(basePackageClasses = MyConfiguration.class)
+ * &#064;ComponentScan
  * public class MyConfiguration {
  * }
  * </pre>
@@ -45,9 +45,10 @@ import org.springframework.context.annotation.Import;
  * <pre class="code">
  * &#064;Configuration
  * &#064;EnableWebFlux
- * &#064;ComponentScan(basePackageClasses = MyConfiguration.class)
+ * &#064;ComponentScan
  * public class MyConfiguration implements WebFluxConfigurer {
  *
+ *     &#064;Autowired
  *     private ObjectMapper objectMapper;
  *
  *     &#064;Override