[readme] update flash attention installation instruction on win platf…

…orm (#6788)

* Update README_zh.md

* Update README.md

README.md

@@ -441,7 +441,7 @@ pip install https://github.com/jllllll/bitsandbytes-windows-webui/releases/downl
 
 #### Install Flash Attention-2
 
-To enable FlashAttention-2 on the Windows platform, you need to install the precompiled `flash-attn` library, which supports CUDA 12.1 to 12.2. Please download the corresponding version from [flash-attention](https://github.com/bdashore3/flash-attention/releases) based on your requirements.
+To enable FlashAttention-2 on the Windows platform, please use the script from [flash-attention-windows-wheel](https://huggingface.co/lldacing/flash-attention-windows-wheel) to compile and install it by yourself.
 
 </details>
 

README_zh.md

@@ -443,7 +443,7 @@ pip install https://github.com/jllllll/bitsandbytes-windows-webui/releases/downl
 
 #### 安装 Flash Attention-2
 
-如果要在 Windows 平台上开启 FlashAttention-2，需要安装预编译的 `flash-attn` 库，支持 CUDA 12.1 到 12.2，请根据需求到 [flash-attention](https://github.com/bdashore3/flash-attention/releases) 下载对应版本安装。
+如果要在 Windows 平台上开启 FlashAttention-2，请使用 [flash-attention-windows-wheel](https://huggingface.co/lldacing/flash-attention-windows-wheel) 中的脚本自行编译与安装。
 
 </details>