[docs] [issue21902] Docstring of math.acosh, asinh, and atanh

[Tim Peters]

Tim Peters added the comment:

One more useless ;-) data point, from Macsyma:

? acosh;
 -- Function: acosh (<x>)
     - Hyperbolic Arc Cosine.

I don't like "area" - while accurate, nobody else uses it.  Gratuitous novelty is no virtue ;-)  I like "inverse" better than "arc", because it's all of accurate, common, and nearly self-evident.

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nosy: +tim.peters

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