Update system-win.md

32位系统只有`Program Files`一个文件夹，64位系统才有`Program Files`和`Program File (x86)`两个文件，这里的描述应该是有问题的
flutterchina · Apr 7, 2019 · efe35c9 · efe35c9
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diff --git a/_includes/setup/system-win.md b/_includes/setup/system-win.md
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 * **工具**: Flutter 依赖下面这些命令行工具.
   * [Git for Windows](https://git-scm.com/download/win) (Git命令行工具)
 
-     如果已安装Git for Windows，请确保命令提示符或PowerShell中运行 `git` 命令，不然在后面运行`flutter doctor`时将出现`Unable to find git in your PATH`错误, 此时需要手动添加`C:\Program Files\Git\bin`至`Path`系统环境变量中。如果是32位的Windows系统，请将`Program Files`换成`Program File (X86)`
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+     如果已安装Git for Windows，请确保命令提示符或PowerShell中运行 `git` 命令，不然在后面运行`flutter doctor`时将出现`Unable to find git in your PATH`错误, 此时需要手动添加`C:\Program Files\Git\bin`至`Path`系统环境变量中。