[docs] [issue18928] Remove misleading documentation for random.shuffle

[R. David Murray]

R. David Murray added the comment:

It seems to me that 2080 (per the accepted answer to your [3]) is indeed "a rather small len(x)", and that the docs are correct as written.

I wonder if it would be worth adding a footnote that explains how to calculate that example 2080 number from the documented period of the random number generator, to make the concepts involved a little bit clearer?

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nosy: +r.david.murray, rhettinger

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