[docs] Add doc examples for DictReader and DictWriter (issue 20351)

[andrew.svetlov at gmail.com]

review


http://bugs.python.org/review/20351/diff/11674/Doc/library/csv.rst
File Doc/library/csv.rst (right):

http://bugs.python.org/review/20351/diff/11674/Doc/library/csv.rst#newcode162
Doc/library/csv.rst:162: A short usage example::
Just use ::

http://bugs.python.org/review/20351/diff/11674/Doc/library/csv.rst#newcode195
Doc/library/csv.rst:195: A short usage example::
:: again

http://bugs.python.org/review/20351/