Revised AbstractAdvisorAutoProxyCreator javadoc

Closes gh-22473

spring-aop/src/main/java/org/springframework/aop/framework/autoproxy/AbstractAdvisorAutoProxyCreator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 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.
@@ -31,8 +31,8 @@ import org.springframework.util.Assert;
  * Generic auto proxy creator that builds AOP proxies for specific beans
  * based on detected Advisors for each bean.
  *
- * <p>Subclasses must implement the abstract {@link #findCandidateAdvisors()}
- * method to return a list of Advisors applying to any object. Subclasses can
+ * <p>Subclasses may override the {@link #findCandidateAdvisors()} method to
+ * return a custom list of Advisors applying to any object. Subclasses can
  * also override the inherited {@link #shouldSkip} method to exclude certain
  * objects from auto-proxying.
  *