[docs] [issue20351] Add doc examples for DictReader and DictWriter

[Roundup Robot]

Roundup Robot added the comment:

New changeset e504c3bc6897 by Berker Peksag in branch '2.7':
Issue #20351: Add examples for csv.DictReader and csv.DictWriter.
https://hg.python.org/cpython/rev/e504c3bc6897

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20351>
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