[docs] [issue12188] PEP 7, C style: add ++ policy and explanation

Antoine Pitrou pitrou@free.fr added the comment:

If there are a few of these idioms, I'm not against adding a new section to PEP 7 (something like the "Programming Recommendations" section in the PEP 8). It's just not worth doing it for the "*p++ = x;" idiom alone IMHO.

If these are recommandations, perhaps we should put them in the devguide instead?

But I agree that it's not worth doing it only for "*p++" anyway.

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