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

Eric V. Smith eric@trueblade.com added the comment:

But don't you think we should put information like this somewhere, even if it's not in PEP 7? We've had a discussion about this particular issue (idiomatic pointer increments when appending to a buffer) at least twice, and there's also the recent "if (const == variable)" issue that feels similar to me.

It seems to me that recording these decisions somewhere has value, just so we don't have to revisit them.

---------- status: pending -> open

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