Improve hint description for disabling automatic usage of broadcast joins

Description

{{We recommend to disable them by
configuring `spark.sql.autoBroadcastJoinThreshold` variable to value `-1`:
sqlContext.sql("SET spark.sql.autoBroadcastJoinThreshold=-1")}}

Configuring spark settings via SQL context is considered to be legacy. All settings should be configured via SparkSession.Builder.

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Marek Novotny

Reporter

Marek Novotny

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Configure