update doc

ZR233 · ZR233 · commit 81d632c31a07 · 2025-03-25T15:58:09.000+08:00
diff --git a/ostool/README.md b/ostool/README.md
@@ -20,6 +20,8 @@ ArceOS为例
 ostool defconfig
 ```
 
+`.project.toml`: 
+
 ```toml
 [compile]
 target = "aarch64-unknown-none"
