Github user srowen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15513#discussion_r83644833
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/CentralMomentAgg.scala
 ---
    @@ -209,7 +244,14 @@ case class Skewness(child: Expression) extends 
CentralMomentAgg(child) {
     }
     
     @ExpressionDescription(
    -  usage = "_FUNC_(x) - Returns the Kurtosis value calculated from values 
of a group.")
    +  usage =
    +    """
    +      _FUNC_(expr) - Returns the Kurtosis value calculated from values of 
a group.
    --- End diff --
    
    Same with kurtosis, they're not proper nouns


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