[docs] [issue16580] Add examples to int.to_bytes and int.from_bytes

Serhiy Storchaka added the comment: I don't call it the examples. Here is the examples:

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(1234).to_bytes(2, 'big') b'\x04\xd2' (1234).to_bytes(2, 'little') b'\xd2\x04' (-1234).to_bytes(2, 'big', signed=True) b'\xfb.' int.from_bytes(b'\xde\xad\xbe\xef', 'big') 3735928559 int.from_bytes(b'\xde\xad\xbe\xef', 'little') 4022250974 int.from_bytes(b'\xde\xad\xbe\xef', 'big', signed=True) -559038737

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