[docs] Typo in collections.Counter class example

[Михаил Голубев]

Hello,

It seems that I found micro bug in Python documentation describing
collections.Counter
class<http://docs.python.org/3.3/library/collections.html#counter-objects>
.
There is the following snippet of code

c.most_common()[:-n:-1]         # n least common elements

Actually this expression returns not *n* least common elements, but rather *n
- 1,* beacuse second boundary  is not included (as usual with slices).
You probably meant c.most_common()[-n:] or c.most_common()[:-n-1:-1] if
reverse ordering is nesessary.

-- 
Best regards
Mikhail Golubev
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