[docs] [issue20628] Improve doc for csv.DictReader 'fieldnames' parameter

[Roundup Robot]

Roundup Robot added the comment:

New changeset a5d4660c6cb6 by R David Murray in branch '3.3':
#20628: make it clear that DictReader/Writer *fieldnames* is a Sequence.
http://hg.python.org/cpython/rev/a5d4660c6cb6

New changeset 9f036047187b by R David Murray in branch '3.3':
#20628: wrap lines to < 80.
http://hg.python.org/cpython/rev/9f036047187b

New changeset 5eb7e29df762 by R David Murray in branch 'default':
Merge #20628: make it clear that DictReader/Writer *fieldnames* is a Sequence.
http://hg.python.org/cpython/rev/5eb7e29df762

New changeset 0e77dd295a88 by R David Murray in branch '2.7':
#20628: make it clear that DictReader/Writer *fieldnames* is a Sequence.
http://hg.python.org/cpython/rev/0e77dd295a88

New changeset 0926adcc335c by R David Murray in branch '2.7':
#20628: wrap lines to < 80.
http://hg.python.org/cpython/rev/0926adcc335c

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nosy: +python-dev

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<http://bugs.python.org/issue20628>
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