Remove obsolete MetadataAwareAspectInstanceFactory Javadoc

We no longer have any JDK 5 related limitations imposed on us as was
the case when MetadataAwareAspectInstanceFactory was introduced; however,
MetadataAwareAspectInstanceFactory will remain as a specialized
sub-interface of AspectInstanceFactory.

spring-aop/src/main/java/org/springframework/aop/aspectj/annotation/MetadataAwareAspectInstanceFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -23,10 +23,6 @@ import org.springframework.lang.Nullable;
  * Subinterface of {@link org.springframework.aop.aspectj.AspectInstanceFactory}
  * that returns {@link AspectMetadata} associated with AspectJ-annotated classes.
  *
- * <p>Ideally, AspectInstanceFactory would include this method itself, but because
- * AspectMetadata uses Java-5-only {@link org.aspectj.lang.reflect.AjType},
- * we need to split out this subinterface.
- *
  * @author Rod Johnson
  * @since 2.0
  * @see AspectMetadata
@@ -35,13 +31,13 @@ import org.springframework.lang.Nullable;
 public interface MetadataAwareAspectInstanceFactory extends AspectInstanceFactory {
 
 	/**
-	 * Return the AspectJ AspectMetadata for this factory's aspect.
+	 * Get the AspectJ AspectMetadata for this factory's aspect.
 	 * @return the aspect metadata
 	 */
 	AspectMetadata getAspectMetadata();
 
 	/**
-	 * Return the best possible creation mutex for this factory.
+	 * Get the best possible creation mutex for this factory.
 	 * @return the mutex object (may be {@code null} for no mutex to use)
 	 * @since 4.3
 	 */