Small typo correction for trek documentation

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I was skimming through trek.txt (since it seems interesting) and I
noticed a small typo.
Diff attached.
SHA512 (trekdiff) =
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Diff made on NetBSD 9.2

--000000000000d7530b05d262317d
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Content-Disposition: attachment; filename=trekdiff
Content-Transfer-Encoding: base64
Content-ID: <f_kwt0293j0>
X-Attachment-Id: f_kwt0293j0

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