RFR: 8214248: (fs) Files:mismatch spec clarifications [v3]

[Alan Bateman]

On Mon, 21 Aug 2023 16:13:51 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Clarify that `Files::mismatch` does not access the file system if both paths locate the same file. Add package documentation about file operations on directories being implementation specific.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8214248: Move mismatch() verbiage to new paragraph

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15350#pullrequestreview-1587739461