[9] Code Review Request For 8164141: [Javadoc] Replace references of Stage with Window in the Window class

[Chien Yang]

Hi Kevin,

Please review the proposed doc fix:

JIRA: https://bugs.openjdk.java.net/browse/JDK-8164141
Webrev: http://cr.openjdk.java.net/~ckyang/JDK-8164141/webrev.00/

Thanks,
- Chien