RFR: 8278168: Add a few missing words to the specification of Files.mismatch

[Brian Burkhalter]

On Thu, 2 Dec 2021 20:46:10 GMT, Pavel Rappo <prappo at openjdk.org> wrote:

> Please review this trivial fix.

Marked as reviewed by bpb (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/6679