gh-108598: clarify limit on length of sequences which can be shuffle()d

[d-rideout]

Fixes Issue #108598

• Issue: Consider a faster alternative algorithm for random.shuffle() #108598

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[ghost]

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[rhettinger]

Thank you for the suggestion, but after reading the edit and the associated discussion, I think we should decline.

To my eyes, the edit doesn't clarify anything but I do see how it might feel a little more satisfying to a highly technical user like yourself who already thoroughly understand PRNG periods, state spaces, shuffling algorithms etc. For other users, I think the current text has served us well for almost two decades.