Update codemod commands to include the Valibot scope

Author: fabian-hiller

website/src/routes/guides/(migration)/migrate-from-zod/index.mdx

@@ -29,10 +29,10 @@ You can also run the codemod locally to migrate your entire codebase at once:
 
 ```bash
 // Preview changes (no writes)
-npx zod-to-valibot "src/**/*.{ts,tsx,js,jsx}" --dry
+npx @valibot/zod-to-valibot "src/**/*.{ts,tsx,js,jsx}" --dry
 
 // Apply changes
-npx zod-to-valibot "src/**/*.{ts,tsx,js,jsx}"
+npx @valibot/zod-to-valibot "src/**/*.{ts,tsx,js,jsx}"
 ```
 
 ## Replace imports