Fix copy-n-paste error in Javadoc

spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/ResponseEntityExceptionHandler.java

@@ -87,7 +87,7 @@ public abstract class ResponseEntityExceptionHandler implements MessageSourceAwa
 
 
 	/**
-	 * Handle all exceptions raised within Spring MVC handling of the request.
+	 * Handle all exceptions raised within Spring WebFlux handling of the request.
 	 * @param ex the exception to handle
 	 * @param exchange the current request-response
 	 */