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

Summary

java.nio.file package description could be clearer on the cases where NPE is thrown

Problem

The package description for java.nio.file has a paragraph to specify that NullPointerException is thrown when constructors or methods are invoked with null. This paragraph doesn't clearly cover the case where methods take an array (varargs in this API) and the array contains a null element.

Solution

Update the package description to make it clear that NPE is also thrown when methods are invoked with an array containing a null element.

Specification

Change this statement in the package description from:

Additionally, invoking a method with a collection containing a {@code null} element will cause a {@code NullPointerException}, unless otherwise specified.

to:

Additionally, invoking a method with an array or collection containing a {@code null} element will cause a {@code NullPointerException}, unless otherwise specified.