RFR: JDK-8227922: DocTreeScanner does not dive into AttributeTree.getValue() and LiteralTree.getBody()

[Jan Lahoda]

Hi,

com.sun.source.util.DocTreeScanner#visitAttribute is not scanning over 
the children of AttributeNode (i.e. AttributeNode#getValue()), and 
DocTreeScanner#visitLiteral is not scanning over the children of 
LiteralNode (i.e. LiteralNode#getBody()). The proposal here is to fix 
DocTreeScanner to scan over the children of these two node types.

Webrev: http://cr.openjdk.java.net/~jlahoda/8227922/webrev.00/
JBS: https://bugs.openjdk.java.net/browse/JDK-8227922

As this change may cause new nodes to be encountered by subclasses of 
DocTreeScanner, with possibly undesirable effects (like in DocLint's 
Checker) and also affects the javadoc for the two methods, CSR appears 
to be needed as well, so I'd like to ask for a review of that as well:

CSR: https://bugs.openjdk.java.net/browse/JDK-8228371

How does this look?

Thanks,
     Jan