[issue7447] Sum() doc and behavior mismatch

[Leonhard Vogt]

Leonhard Vogt <leonhard.vogt at gmx.ch> added the comment:

another patch:
- moved string case to first position, i think it's the most important.
- reworded (shortened) list case.
- wrapped for <80 caracter lines.

still using itertools.itertools.chain.from_iterable as mentioned in previous message. I missed georgs use of ~ in the link, but i think its clearer to mention the full name of the function anyway.

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Added file: http://bugs.python.org/file18223/functions.rst.patch4.txt

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