Fix javadoc warnings

Before this change there were numerous javadoc warnings being reported
while building Spring framework API.

This commit resolves most of the javadoc warnings, reducing the total
number from 265 to 103.

Issue: SPR-9113

spring-aop/src/main/java/org/springframework/aop/interceptor/AsyncExecutionInterceptor.java

@@ -32,7 +32,7 @@ import org.springframework.util.ReflectionUtils;
 /**
  * AOP Alliance <code>MethodInterceptor</code> that processes method invocations
  * asynchronously, using a given {@link org.springframework.core.task.AsyncTaskExecutor}.
- * Typically used with the {@link org.springframework.context.task.Async} annotation.
+ * Typically used with the {@link org.springframework.scheduling.annotation.Async} annotation.
  *
  * <p>In terms of target method signatures, any parameter types are supported.
  * However, the return type is constrained to either <code>void</code> or

spring-aop/src/main/java/org/springframework/aop/target/AbstractPrototypeBasedTargetSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 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.
@@ -28,8 +28,9 @@ import org.springframework.beans.factory.DisposableBean;
 import org.springframework.beans.factory.config.ConfigurableBeanFactory;
 
 /**
- * Base class for dynamic {@link TargetSource} implementations that create new prototype
- * bean instances to support a pooling or new-instance-per-invocation strategy.
+ * Base class for dynamic {@link org.springframework.aop.TargetSource} implementations
+ * that create new prototype bean instances to support a pooling or
+ * new-instance-per-invocation strategy.
  *
  * <p>Such TargetSources must run in a {@link BeanFactory}, as it needs to
  * call the <code>getBean</code> method to create a new prototype instance.