[docs] [issue18269] Clarify which integer is required in os.chmod() exception

[Brett Cannon]

Brett Cannon added the comment:

That's expected with that kind of argument. os.fchmod() and os.chmod() only accept a path as a string or a file descriptor as an integer as specified in the docs: http://docs.python.org/3/library/os.html#os.chmod

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resolution:  -> invalid
status: open -> closed

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