[MITgcm-support] manual typo

[jeff polton]

Not sure that this is necessarily the right list but I think that there 
ought to be a minus sign instead of a plus sign in Eqn 1.41
http://mitgcm.org/sealion/online_documents/node21.html
in front of the viscA4 coefficient, or at least the sign needs to be 
different to the del^2 coefficient sign.

Thanks,

Jeff

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Scripps Institution of Oceanography, UCSD,
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