完善了mysql安装文档

后端/Mysql/7.centos7离线安装mysql5.7.md

@@ -10,7 +10,7 @@ rpm -e --nodeps mariadb-libs-5.5.64-1.el7.x86_64
 rpm -qa |grep -i mysql
 yum remove mysql*
 find / -name mysql # 删除相关目录
-rm -rf x
+rm -rf #删除相关目录
 rm -rf /etc/my.cnf
 rm -rf /var/log/mysqld.log
 ```