fix a term

README.md

@@ -38,7 +38,7 @@ These platforms are officially tested.
 + Android 64-bit / 32-bit
 + iOS 64-bit
 + Emscripten 32-bit
-+ Raspberry Pi 64-bit
++ Raspberry Pi OS 64-bit
 
 ## Quick Start
 

README_zh.md

@@ -27,7 +27,7 @@ pkpy 支持任何拥有 C++17 编译器的平台。
 + Android 64-bit / 32-bit
 + iOS 64-bit
 + Emscripten 32-bit
-+ Raspberry Pi 64-bit
++ Raspberry Pi OS 64-bit
 
 ## 快速上手
 

docs/index.md

@@ -39,7 +39,7 @@ These platforms are officially tested.
 + Android 64-bit / 32-bit
 + iOS 64-bit
 + Emscripten 32-bit
-+ Raspberry Pi 64-bit
++ Raspberry Pi OS 64-bit
 
 ## Sponsor me