spark git commit: [SPARK-10315] remove document on spark.akka.failure-detector.threshold

Repository: spark Updated Branches: refs/heads/branch-1.5 965b3bb0e - db1971501 [SPARK-10315] remove document on spark.akka.failure-detector.threshold https://issues.apache.org/jira/browse/SPARK-10315 this parameter is not used any longer and there is some mistake in the current document ,

spark git commit: [SPARK-10315] remove document on spark.akka.failure-detector.threshold

Repository: spark Updated Branches: refs/heads/master dc86a227e - 84baa5e9b [SPARK-10315] remove document on spark.akka.failure-detector.threshold https://issues.apache.org/jira/browse/SPARK-10315 this parameter is not used any longer and there is some mistake in the current document ,