Fix copy-n-paste error in Javadoc in ResponseEntityExceptionHandler

Closes gh-22589

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/ResponseEntityExceptionHandler.java

@@ -418,7 +418,7 @@ protected ResponseEntity<Object> handleNoHandlerFoundException(
 	}
 
 	/**
-	 * Customize the response for NoHandlerFoundException.
+	 * Customize the response for AsyncRequestTimeoutException.
 	 * <p>This method delegates to {@link #handleExceptionInternal}.
 	 * @param ex the exception
 	 * @param headers the headers to be written to the response