Add missing edition

0xPoe · 0xPoe · commit fa815f345cc6 · 2022-10-13T23:14:31.000+08:00
Signed-off-by: hi-rustin &lt;rustin.liu@gmail.com&gt;
diff --git a/src/doc/src/reference/build-script-examples.md b/src/doc/src/reference/build-script-examples.md
@@ -49,6 +49,7 @@ Here we can see that we have a `build.rs` build script and our binary in
 [package]
 name = "hello-from-generated-code"
 version = "0.1.0"
+edition = "2021"
 ```
 
 Let’s see what’s inside the build script:
