[SPARK-11335][STREAMING] update kafka direct python docs on how to get the offset ranges for a KafkaRDD#9289

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ontarionick:update_kafka_direct_python_docs

Commits on Oct 27, 2015

update kafka direct python docs on how to get the offset ranges for a KafkaRDD
ontarionick
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use global variable instead of emptying then extending list
ontarionick
committed