hg: openjfx/9-dev/rt: 8130675: Document that setting scene on stage changes stage size unless explicitly set

[chien.yang at oracle.com]

Changeset: 4c8db4731758
Author:    ckyang
Date:      2016-08-16 14:12 -0700
URL:       http://hg.openjdk.java.net/openjfx/9-dev/rt/rev/4c8db4731758

8130675: Document that setting scene on stage changes stage size unless explicitly set
Reviewed-by: kcr

! modules/javafx.graphics/src/main/java/javafx/stage/Window.java