Polish "Update reference to deprecated CronSequenceGenerator"

See gh-26651

spring-context/src/main/java/org/springframework/scheduling/annotation/Scheduled.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2021 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.

spring-context/src/main/java/org/springframework/scheduling/config/CronTask.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -20,8 +20,8 @@ import org.springframework.scheduling.support.CronTrigger;
 
 /**
  * {@link TriggerTask} implementation defining a {@code Runnable} to be executed according
- * to a {@linkplain org.springframework.scheduling.support.CronSequenceGenerator standard
- * cron expression}.
+ * to a {@linkplain org.springframework.scheduling.support.CronExpression#parse(String)
+ * standard cron expression}.
  *
  * @author Chris Beams
  * @since 3.2

spring-context/src/main/resources/org/springframework/scheduling/config/spring-task.xsd

@@ -244,7 +244,7 @@
 		<xsd:attribute name="cron" type="xsd:string" use="optional">
 			<xsd:annotation>
 				<xsd:documentation><![CDATA[
-	A cron-based trigger. See the org.springframework.scheduling.support.CronSequenceGenerator
+	A cron-based trigger. See the org.springframework.scheduling.support.CronExpression#parse
 	JavaDoc for example patterns.
 				]]></xsd:documentation>
 			</xsd:annotation>