update README

Author: crazywhalecc

README-zh.md

@@ -120,7 +120,7 @@ buildroot/bin/php-fpm -v
 
 ### 在线构建（使用 GitHub Actions）
 
-使用 GitHub Action 可以轻松构建静态编译的 PHP，
+上方直接下载的二进制不能满足需求时，可使用 GitHub Action 可以轻松构建静态编译的 PHP，
 同时自行定义要编译的扩展。
 
 1. Fork 本项目。

README.md

@@ -121,7 +121,8 @@ which can be downloaded directly according to your needs.
 
 ### Build Online (using GitHub Actions)
 
-Use GitHub Action to easily build a statically compiled PHP,
+When the above direct download binaries cannot meet your needs,
+you can use GitHub Action to easily build a statically compiled PHP,
 and at the same time define the extensions to be compiled by yourself.
 
 1. Fork me.