[docs] [issue27825] Make the documentation for statistics' data argument clearer.

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

Updated patch based on feedback.

Steven, I removed the example of median_grouped using Fractions.
Would you be able to suggest better examples to be added in the docs?

I also noticed that there are more examples of median_grouped in the paragraph below. 

Thanks.

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Added file: http://bugs.python.org/file45097/issue27825v2.patch

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