RFR: JDK-8167992 : Update documentation of java.util.Date class

[Rachna Goel]

Hi,

Please review a simple documentation fix for java.util.Date class.

Bug : https://bugs.openjdk.java.net/browse/JDK-8167992

webrev : http://cr.openjdk.java.net/~rgoel/JDK-8167992/webrev/

Fix : updated links pointing to old websites.

Thanks,
Rachna