[SPARK-21508][DOC] Fix example code provided in Spark Streaming Documentation #18770
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What changes were proposed in this pull request?
JIRA ticket : SPARK-21508
correcting a mistake in example code provided in Spark Streaming Custom Receivers Documentation
The example code provided in the documentation on 'Spark Streaming Custom Receivers' has an error.
doc link : https://spark.apache.org/docs/latest/streaming-custom-receivers.html
instead of
lines.flatMap(_.split(" "))
it should be
customReceiverStream.flatMap(_.split(" "))
How was this patch tested?
this documentation change is tested manually by jekyll build , running below commands
screen-shots provided below
![screenshot1](https://user-images.githubusercontent.com/8828470/28744636-a6de1ac6-7482-11e7-843b-ff84b5855ec0.png)
![screenshot2](https://user-images.githubusercontent.com/8828470/28744637-a6def496-7482-11e7-9512-7f4bbe027c6a.png)