Update Hadoop单机环境搭建.md

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@ -209,7 +209,7 @@ sudo systemctl stop firewalld.service
```shell
# 如果没有mapred-site.xml则拷贝一份样例文件后再修改
cp ./mapred-site.xml.template ./mapred-site.xml
cp mapred-site.xml.template mapred-site.xml
```
```xml