Update THESHOLD name in jacobi.c

[Niels Möller]

Seth Troisi <braintwo at gmail.com> writes:

> Change and screenshots of pdf / html documentation can be seen at
> https://github.com/sethtroisi/libgmp/pull/5

Thanks for your patience. Now applied. 

Torbjörn, do we have any book-keeping of contributions to the GMP
manual? I see no doc changes listed in AUTHORS. (My understanding is
that Seth's changes are covered by Google's corporate copyright
assignment to the FSF, hence no additional copyright paperwork).

Regards,
/Niels

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