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

    https://github.com/apache/spark/pull/10587#discussion_r49174933
  
    --- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
    @@ -1089,6 +1097,14 @@ abstract class RDD[T: ClassTag](
        * and one operation for merging two U's, as in scala.TraversableOnce. 
Both of these functions are
        * allowed to modify and return their first argument instead of creating 
a new U to avoid memory
        * allocation.
    +   *
    +   * @param zeroValue the initial value for the accumulated result of each 
partition for the seqOp
    +   *                  operator, and also the initial value for the combine 
results from different
    +   *                  partitions for the conbOp operator.
    +   *                  - this will typically be the neutral element.
    --- End diff --
    
    There are some typos now, like conbOp instead of combOp. Also there's a 
dangling phrase in both starting with "-" which is supposed to join the 
previous sentence? while you're here you can back-tick `Nil`


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