RFR: 8220816: (fs) Files.createDirectory should make it more obvious that it fails when the directory already exists [v6]

[Brian Burkhalter]

On Wed, 19 Nov 2025 20:13:42 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Slightly changes the specification of `Files.createDirectory` to highlight that it fails if a filesystem entity already exists at the given location.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8220816: Change FAEE for CREATE_NEW cases

No new testable assertions were added or removed.

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PR Comment: https://git.openjdk.org/jdk/pull/28378#issuecomment-3597732140