[docs] [issue26957] Docs: remove duplicate "the" in description of `%z` in datetime docs

[Berker Peksag]

Berker Peksag added the comment:

Thanks!

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nosy: +berker.peksag
resolution:  -> fixed
stage:  -> resolved
status: open -> closed
type: enhancement -> behavior
versions: +Python 3.5, Python 3.6

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<http://bugs.python.org/issue26957>
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