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

Thu May 11 02:16:49 UTC 2023

On Wed, 10 May 2023 16:52:12 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>>> Check Files as there are several there.
>> 
>> I found one there and one in Path.
>
>> > Check Files as there are several there.
>> 
>> I found one there and one in Path.
> 
> Forget it: missed some. Correcting.

Re-scanned `java.nio` tree. Hopefully [a531b06](https://github.com/openjdk/jdk/pull/13870/commits/a531b06b6fa2ed34080c64208b2fae4eff450c63) caught everything this time.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13870#discussion_r1190567087