[MINOR] Fix typos in ML scaladocs

## What changes were proposed in this pull request?

Fixed some typos found in ML scaladocs

## How was this patch tested?

NA

Author: Bryan Cutler <cutlerb@gmail.com>

Closes #20300 from BryanCutler/ml-doc-typos-MINOR.

mllib/src/main/scala/org/apache/spark/ml/stat/Summarizer.scala

@@ -75,7 +75,7 @@ sealed abstract class SummaryBuilder {
  *   val Row(meanVec) = meanDF.first()
  * }}}
  *
- * Note: Currently, the performance of this interface is about 2x~3x slower then using the RDD
+ * Note: Currently, the performance of this interface is about 2x~3x slower than using the RDD
  * interface.
  */
 @Experimental

mllib/src/main/scala/org/apache/spark/ml/tuning/TrainValidationSplit.scala

@@ -93,7 +93,7 @@ class TrainValidationSplit @Since("1.5.0") (@Since("1.5.0") override val uid: St
   def setSeed(value: Long): this.type = set(seed, value)
 
   /**
-   * Set the mamixum level of parallelism to evaluate models in parallel.
+   * Set the maximum level of parallelism to evaluate models in parallel.
    * Default is 1 for serial evaluation
    *
    * @group expertSetParam
@@ -112,7 +112,8 @@ class TrainValidationSplit @Since("1.5.0") (@Since("1.5.0") override val uid: St
    * for more information.
    *
    * @group expertSetParam
-   */@Since("2.3.0")
+   */
+  @Since("2.3.0")
   def setCollectSubModels(value: Boolean): this.type = set(collectSubModels, value)
 
   @Since("2.0.0")