[9, 8u] review request: [JAVADOC] Change docs to not refer to full-screen exclusive mode

[Kevin Rushforth]

David,

Please review this simple doc fix.

https://bugs.openjdk.java.net/browse/JDK-8089847
http://cr.openjdk.java.net/~kcr/8089847/webrev.00/

Thanks.

-- Kevin