[docs] [issue7450] document that os.chmod accepts an octal digit mode

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

I guess you mean 0o755.
I think it would be better to mention explicitly octal literals, since they are not so common and, especially in 2.x, 0755 might be confused with a "normal" decimal number.

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