RFR: 8292566: Add reference to the java.nio.file package in java.nio package documentation

[Brian Burkhalter]

On Wed, 17 Aug 2022 20:29:47 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Add a phrase about `java.nio.file` to the sentence in the `java.nio` package documentation describing its subpackages.

Note: I am not updating the CSR until there is consensus in this PR.

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PR: https://git.openjdk.org/jdk/pull/9910