Update python KafkaIO docstring to add the use_deprecated_read option #29588

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Build python wheels on for windows-latest	4m 39s
Build python wheels on for ubuntu-20.04	2m 18s
Build python wheels on for ubuntu-20.04	1m 18s
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Build python wheels on for ubuntu-20.04	1m 19s
Build python wheels on for ubuntu-20.04	1h 13m 49s
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	3h 55m 38s

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