Fix a typo of "threshold"

[yinxusen]

@mengxr

[WangTaoTheTonic]

There's another same typo in https://github.com/apache/spark/blob/master/sql/hive/src/test/resources/data/conf/hive-log4j.properties#L26

Maybe we can fix it together.

[SparkQA]

Test build #31252 has finished for PR 5769 at commit 43235f4.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • case class Repartition(numPartitions: Int, shuffle: Boolean, child: LogicalPlan)
  • case class RepartitionByExpression(partitionExpressions: Seq[Expression], child: LogicalPlan)
  • case class Repartition(numPartitions: Int, shuffle: Boolean, child: SparkPlan)
• This patch does not change any dependencies.

[yinxusen]

@WangTaoTheTonic Yes, there are three "threshhold" in spark package in total after I grep it. @mengxr If I modify the file in sql package, can you merge it?

[mengxr]

Yes, but let's do that separately. I've merged this into master. I didn't backport it because this is in a private method.