[doc] Fixed hadoop link to avoid dead link

https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/CommandsManual.html#jar
point to the latest docs and will be changed more frequent than fixed link
https://hadoop.apache.org/docs/r3.2.4/hadoop-project-dist/hadoop-common/CommandsManual.html#jar.
So I change to the fixed link

docs/docs/en/guide/task/map-reduce.md

@@ -2,7 +2,7 @@
 
 ## Overview
 
-MapReduce(MR) task type used for executing MapReduce programs. For MapReduce nodes, the worker submits the task by using the Hadoop command `hadoop jar`. See [Hadoop Command Manual](https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/CommandsManual.html#jar) for more details.
+MapReduce(MR) task type used for executing MapReduce programs. For MapReduce nodes, the worker submits the task by using the Hadoop command `hadoop jar`. See [Hadoop Command Manual](https://hadoop.apache.org/docs/r3.2.4/hadoop-project-dist/hadoop-common/CommandsManual.html#jar) for more details.
 
 ## Create Task
 

docs/docs/zh/guide/task/map-reduce.md

@@ -2,7 +2,7 @@
 
 ## 综述
 
-MapReduce(MR) 任务类型，用于执行 MapReduce 程序。对于 MapReduce 节点，worker 会通过使用 Hadoop 命令 `hadoop jar` 的方式提交任务。更多详情查看 [Hadoop Command Manual](https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/CommandsManual.html#jar)。
+MapReduce(MR) 任务类型，用于执行 MapReduce 程序。对于 MapReduce 节点，worker 会通过使用 Hadoop 命令 `hadoop jar` 的方式提交任务。更多详情查看 [Hadoop Command Manual](https://hadoop.apache.org/docs/r3.2.4/hadoop-project-dist/hadoop-common/CommandsManual.html#jar)。
 
 ## 创建任务