Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: SurbhiAgarwal1

documentation/content/en/book/04-using-functions/wasm-functions.md

@@ -47,7 +47,7 @@ pipeline:
 kpt fn render my-package --allow-alpha-wasm
 ```
 
-kpt will detect the function as WASM if the OCI image has a `js/wasm` platform manifest.
+When you use `--allow-alpha-wasm`, kpt treats the `image:` as a WASM image and requires the OCI image to include a `js/wasm` platform manifest; if it does not, the command will fail.
 
 ### With `fn eval`