[docs] [issue21071] struct.Struct.format is bytes, but should be str

[STINNER Victor]

STINNER Victor added the comment:

Ok, I opened a thread on python-dev:
https://mail.python.org/pipermail/python-dev/2017-March/147688.html

Martin: "At a minimum you should acknowledge it in the “porting”
section of What’s New."

I wasn't sure if the change was worth it to be mentionned in What's
New in Python 3.7. Ok, will do for the next round (I'm now waiting for
more feedback on my python-dev thread and this issue.)

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<http://bugs.python.org/issue21071>
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