RFR: 8307409: Refactor usage examples to use @snippet in the java.nio packages [v6]

[Alan Bateman]

On Thu, 11 May 2023 02:16:48 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: Update after scanning java.nio source tree

I skimmed through the latest update and it looks okay. Roger spotted several issues in earlier iterations and would be good to wait for him to look at the latest version.

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Marked as reviewed by alanb (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13870#pullrequestreview-1421792995