[CORE] The descriptionof jobHistory config should be spark.history.fs.logDirectory

The config option  is spark.history.fs.logDirectory, not spark.fs.history.logDirectory. So the descriptionof  should be changed. Thanks.

Author: KaiXinXiaoLei <huleilei1@huawei.com>

Closes #5332 from KaiXinXiaoLei/historyConfig and squashes the following commits:

5ffbfb5 [KaiXinXiaoLei] the describe of jobHistory config is error

core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala

@@ -118,7 +118,7 @@ private[history] class FsHistoryProvider(conf: SparkConf) extends ApplicationHis
     if (!fs.exists(path)) {
       var msg = s"Log directory specified does not exist: $logDir."
       if (logDir == DEFAULT_LOG_DIR) {
-        msg += " Did you configure the correct one through spark.fs.history.logDirectory?"
+        msg += " Did you configure the correct one through spark.history.fs.logDirectory?"
       }
       throw new IllegalArgumentException(msg)
     }