Please review this change to copy the normative parts of the Java XML
Digital Signature API Specification into the java.xml.crypto module
javadocs and update relevant links in the javadocs. The Java XML Digital
Signature API Specification was published as part of JSR 105 and was
previously included in the JDK Security Guides but as of JDK 10 had been
removed and is no longer maintained.
Also as part of this change, I moved all of the package.html files in
this module to the newer package-info.java format.
webrev:http://cr.openjdk.java.net/~mullan/webrevs/8210448/webrev.00/
CSR: https://bugs.openjdk.java.net/browse/JDK-8212188
--Sean
