[issue37548] Document range of atan, acos and asin

[Giovanni Cappellotto]

Change by Giovanni Cappellotto <potomak84 at gmail.com>:


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keywords: +patch
pull_requests: +14517
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/14717

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<https://bugs.python.org/issue37548>
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