Update README.zh-CN.md

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 [第六章. 实验4：设备管理](chapter6_device.md)
- - [6.1 实验3的基础知识](chapter6_device.md#fundamental)  
+ - [6.1 实验4的基础知识](chapter6_device.md#fundamental)  
 - [6.2 lab3_1 轮询方式](chapter6_device.md#polling)  
 - [6.3 lab3_2 中断方式](chapter6_device.md#PLIC)  
 - [6.4 lab3_3 主机设备访问](chapter6_device.md#hostdevice)