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

[Raymond Hettinger]

Raymond Hettinger added the comment:

Thanks Mariatta.

As discussed in chat, I dropped the extra fractions examples because they didn't seem to add value.

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nosy: +rhettinger
resolution:  -> fixed
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27825>
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