[MLU] update installation package version to 2.4.0

Author: ShawnNew

docs/guides/hardware_support/mlu_docs/paddle_install_cn.md

@@ -77,7 +77,7 @@ Sat Oct  8 11:22:22 2022
 **第一步**：下载 Python3.7 wheel 安装包
 
 ```bash
-pip install paddlepaddle-mlu==0.0.0 -f https://paddle-device.bj.bcebos.com/develop/mlu/develop.html
+pip install paddlepaddle-mlu==2.4.0 -f https://paddle-device.bj.bcebos.com/develop/mlu/develop.html
 ```
 
 **第二步**：验证安装包