Update postProcessBeforeInstantiation comment on factory methods

Closes gh-22867

spring-beans/src/main/java/org/springframework/beans/factory/config/InstantiationAwareBeanPostProcessor.java

 /*
- * 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.
@@ -54,8 +54,9 @@ public interface InstantiationAwareBeanPostProcessor extends BeanPostProcessor {
 	 * will be short-circuited. The only further processing applied is the
 	 * {@link #postProcessAfterInitialization} callback from the configured
 	 * {@link BeanPostProcessor BeanPostProcessors}.
-	 * <p>This callback will only be applied to bean definitions with a bean class.
-	 * In particular, it will not be applied to beans with a factory method.
+	 * <p>This callback will be applied to bean definitions with their bean class,
+	 * as well as to factory-method definitions in which case the returned bean type
+	 * will be passed in here.
 	 * <p>Post-processors may implement the extended
 	 * {@link SmartInstantiationAwareBeanPostProcessor} interface in order
 	 * to predict the type of the bean object that they are going to return here.
@@ -66,7 +67,8 @@ public interface InstantiationAwareBeanPostProcessor extends BeanPostProcessor {
 	 * or {@code null} to proceed with default instantiation
 	 * @throws org.springframework.beans.BeansException in case of errors
 	 * @see #postProcessAfterInstantiation
-	 * @see org.springframework.beans.factory.support.AbstractBeanDefinition#hasBeanClass
+	 * @see org.springframework.beans.factory.support.AbstractBeanDefinition#getBeanClass()
+	 * @see org.springframework.beans.factory.support.AbstractBeanDefinition#getFactoryMethodName()
 	 */
 	@Nullable
 	default Object postProcessBeforeInstantiation(Class<?> beanClass, String beanName) throws BeansException {