[doc] specified operating system requirement (#3019)

* [doc] specified operating system requirement

* polish code

docs/source/en/get_started/installation.md

@@ -1,9 +1,13 @@
 <!-- doc-test-command: echo "installation.md does not need test" -->
 
 # Setup
-> Colossal-AI currently only supports the Linux operating system and has not been tested on other OS such as Windows and macOS.
->
-> Environment Requirement: PyTorch 1.10 ~ 1.12 (WIP higher version), Python >= 3.7, CUDA >= 11.0. If you encounter any problem about installation, you may want to raise an [issue](https://github.com/hpcaitech/ColossalAI/issues/new/choose) in this repository.
+
+Requirements:
+- PyTorch >= 1.11 (PyTorch 2.x in progress)
+- Python >= 3.7
+- CUDA >= 11.0
+  
+If you encounter any problem about installation, you may want to raise an [issue](https://github.com/hpcaitech/ColossalAI/issues/new/choose) in this repository.
 
 
 ## Download From PyPI
@@ -14,6 +18,8 @@ You can install Colossal-AI with
 pip install colossalai
 ```
 
+**Note: only Linux is supported for now**
+
 If you want to build PyTorch extensions during installation, you can use the command below. Otherwise, the PyTorch extensions will be built during runtime.
 
 ```shell

docs/source/zh-Hans/get_started/installation.md

@@ -1,7 +1,12 @@
 # 安装
-> Colossal-AI 目前仅支持Linux操作系统，没有在其他操作系统如Windows和macOS进行测试
->
-> 环境要求: PyTorch 1.10 ~ 1.12 (更新版本正在兼容中), Python >= 3.7, CUDA >= 11.0。如果你遇到安装问题，可以向本项目 [反馈](https://github.com/hpcaitech/ColossalAI/issues/new/choose)。
+
+环境要求:
+
+- PyTorch >= 1.11 (PyTorch 2.x 正在适配中)
+- Python >= 3.7
+- CUDA >= 11.0
+  
+如果你遇到安装问题，可以向本项目 [反馈](https://github.com/hpcaitech/ColossalAI/issues/new/choose)。
 
 ## 从PyPI上安装
 
@@ -11,6 +16,8 @@
 pip install colossalai
 ```
 
+**注：现在只支持Linux。**
+
 如果你想同时安装PyTorch扩展的话，可以添加`CUDA_EXT=1`。如果不添加的话，PyTorch扩展会在运行时自动安装。
 
 ```shell