[Doc]--Update contents for Pulsar adaptor for Apache Spark #12338
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Motivation
Contents in the Pulsar adaptor for Apache Spark document are not correct. Update the docs based on eng's input.
Modifications
Update "Spark streaming connector" to "spark streaming receiver"
Remove Spark structured streaming connector section
Update"The Spark Streaming receiver for Pulsar is a custom receiver that enables Apache Spark Streaming to receive data from Pulsar." to "The Spark Streaming receiver for Pulsar is a custom receiver that enables Apache Spark Streaming to receive raw data from Pulsar."
Fix some typos