(fs spec) Package description could be clearer on the cases where NPE is thrown

Unexpected NPE is thrown in cases when null passed as element of options array, for example
Files.newBufferedWriter(myPath, new OpenOption[]{null})
Files.newBufferedWriter(myPath, new OpenOption[]{null, StandardOpenOption.CREATE})

java.nio.file package's spec (http://jre.us.oracle.com/java/re/jdk/9/promoted/all/b35/docs/api/java/nio/file/package-summary.html
) says that


"Unless otherwise noted, passing a null argument to a constructor or method of any class or interface in this package will cause a NullPointerException to be thrown.
Additionally, invoking a method with a collection containing a null element will cause a NullPointerException, unless otherwise specified."

As we think it would be great to specify that NPE will be thrown in case of null-elements in array too.


Tested with JDK9b35
Failed JCK tests is under development