[docs] [issue36099] Clarify the difference between mu and xbar in the statistics documentation

[Davin Potts]

Davin Potts <python at discontinuity.net> added the comment:

Without necessarily defining what each means, perhaps it is sufficient to change this clause in the docs:
    it should be the mean of data

For pvariance() it could read as:
    it should be the *population* mean of data

And for variance() it could read as:
    it should be the *sample* mean of data

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nosy: +davin

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36099>
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