RFR of JDK-8174697: Fix @since in module-info.java in dev/jaxws repo

[Hamlin Li]

Would you please review the below patch?

bug: https://bugs.openjdk.java.net/browse/JDK-8174697
webrev: http://cr.openjdk.java.net/~mli/8174697/webrev.00/

Thank you
-Hamlin