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

[Raymond Hettinger]

Raymond Hettinger added the comment:

> I'd be happy to replace the 'inverse' by 'arc' 
> if that's what people prefer.

Yes, please.

> And the "in radians" bit is utterly nonsensical

Yes, again.

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<http://bugs.python.org/issue21902>
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