RFR: 8321561: (fs) Add an API note to Files.move clarifying possible non-atomic behavior

[Brian Burkhalter]

On Mon, 11 Dec 2023 16:29:26 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Make it clear that a `FileAlreadyExistsException` may be thrown by `Files.move` even if the `REPLACE_EXISTING` option is specified.

continue;

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PR Comment: https://git.openjdk.org/jdk/pull/17061#issuecomment-1881835361