RFR: 8302979: (fs) Files usage of SUPPORTED_CHARSETS could be simplified

[Sergey Tsypanov]

On Tue, 21 Feb 2023 15:57:33 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Code of `Files.lines()` could be slightly simplified:
>> 
>> - use charsets instead of their names
>> - use `Set.of()` instead of `HashSet` in `FileChannelLinesSpliterator`
>
> @stsypanov Can you fix the description to match the JBS issue?

@AlanBateman done!

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PR: https://git.openjdk.org/jdk/pull/12688