Fix a typo and remove chekced exception annotation

Author: HyukjinKwon

core/src/main/scala/org/apache/spark/SparkContext.scala

@@ -2061,9 +2061,8 @@ class SparkContext(config: SparkConf) extends Logging {
    * Cancel a given job if it's scheduled or running.
    *
    * @param jobId the job ID to cancel
-   * @throws InterruptedException if the cancel message cannot be sent
+   * @note Throws `InterruptedException` if the cancel message cannot be sent
    */
-  @throws(classOf[InterruptedException])
   def cancelJob(jobId: Int) {
     dagScheduler.cancelJob(jobId)
   }
@@ -2072,9 +2071,8 @@ class SparkContext(config: SparkConf) extends Logging {
    * Cancel a given stage and all jobs associated with it.
    *
    * @param stageId the stage ID to cancel
-   * @throws InterruptedException if the cancel message cannot be sent
+   * @note Throws `InterruptedException` if the cancel message cannot be sent
    */
-  @throws(classOf[InterruptedException])
   def cancelStage(stageId: Int) {
     dagScheduler.cancelStage(stageId)
   }

mllib/src/main/scala/org/apache/spark/mllib/tree/configuration/BoostingStrategy.scala

@@ -39,7 +39,7 @@ import org.apache.spark.mllib.tree.loss.{LogLoss, Loss, SquaredError}
  *                      If the current loss on the validation set is greater than 0.01, the diff
  *                      of validation error is compared to relative tolerance which is
  *                      validationTol * (current loss on the validation set).
- *                      If the current loss on the validation set is less than or euqal to 0.01,
+ *                      If the current loss on the validation set is less than or equal to 0.01,
  *                      the diff of validation error is compared to absolute tolerance which is
  *                      validationTol * 0.01.
  *                      Ignored when