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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 71dd21a3b9cc by Raymond Hettinger in branch '3.6':
Issue #27825: Improve for statistics data arguments. (Contributed by Mariatta Wijaya.)
https://hg.python.org/cpython/rev/71dd21a3b9cc

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nosy: +python-dev

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