Update windows install docs

Signed-off-by: Nzhoufeng <zhoufeng54@huawei.com>

install/mindspore_cpu_win_install.md

@@ -70,6 +70,7 @@
     ```bash
     call build.bat
     ```
+    > - 需确保源码路径中不含中文、日文等字符。
     > - 在执行上述命令前，需保证`mingw64\bin\`路径和可执行文件`cmake`所在路径已加入环境变量PATH中。
     > - 如git没有安装在`ProgramFiles`，在执行上述命令前，需设置环境变量指定`patch.exe`的位置，如git安装在`D:\git`时，需设置`set MS_PATCH_PATH=D:\git\usr\bin`。
     > - `build.bat`中会执行`git clone`获取第三方依赖库的代码，请提前确保git的网络设置正确可用。

install/mindspore_cpu_win_install_en.md

@@ -70,6 +70,7 @@ This document describes how to quickly install MindSpore on a Windows system wit
     ```bash
     call build.bat
     ```
+    > - Ensure that path of source code does not include special characters (Chinese, Janpanese characters etc.).
     > - Before running the preceding command, ensure that the paths of `mingw64\bin\` and the executable files `cmake` have been added to the environment variable PATH.
     > - If git was not installed in `ProgramFiles`, you will need to set environment variable to where `patch.exe` is allocated. For example, when git was install in `D:\git`, `set MS_PATCH_PATH=D:\git\usr\bin`.
     > - In the `build.bat` script, the git clone command will be executed to obtain the code in the third-party dependency database. Ensure that the network settings of Git are correct.