The following 2 pages have incorrect information and apparently not intended to be part of the JDK 9 documentation. They need to be removed:

http://download.java.net/java/jdk9/docs/technotes/tools/windows/java.html

http://download.java.net/java/jdk9/docs/technotes/tools/unix/java.html

There may be similar content that would also need to be removed. My understanding of what Clifford said is that the docs located at http://docs.oracle.com/javase/9/ should be the only JDK 9 docs made public.