[docs] [issue19304] Typo in statistics.rst

[Roundup Robot]

Roundup Robot added the comment:

New changeset 900460f0fb2a by Ned Deily in branch 'default':
Issue #19304: Fix typos noted by Claudiu Popa.
http://hg.python.org/cpython/rev/900460f0fb2a

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19304>
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