RFR: 8307409: Refactor usage examples to use @snippet in the java.nio packages [v8]

[Roger Riggs]

On Thu, 11 May 2023 21:38:33 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Convert the `<pre>{@code ...}</pre>` and some other patterns to `{@snippet ..}`.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8307409: Move id attribute from <p> to {@snippet}

Marked as reviewed by rriggs (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13870#pullrequestreview-1423481089