RFR: 8307409: Refactor usage examples to use @snippet in the java.nio packages [v3]

[Brian Burkhalter]

On Wed, 10 May 2023 16:48:14 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> Check Files as there are several there.

I found one there and one in Path.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13870#discussion_r1190174195