RFR: 8307409: Refactor usage examples to use @snippet in the java.nio packages [v5]

[Alan Bateman]

On Wed, 10 May 2023 17:02:20 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: Remove overlooked HTML entities in Files

There are some largish examples in FileVisitor, were they missed?

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PR Comment: https://git.openjdk.org/jdk/pull/13870#issuecomment-1542606573