JavaSound javadoc clarification

The javadoc for java sound have some strange places which should be clarified. Examples:
 - ReverbType.hashcode() - "Finalizes the hashcode method." - The spec just mention that the method is final.
 - CompoundControl.Type - "Static instances are provided for the common types." - But there are no static instances in this class.
 - Some docs for private API can be improved also, so in the future we will be able to enable the doclint for private api as well.