docs: Update code example for no env variable injection

It looked like this was wrong to me - with no env variable injection, all of the env statements should exist in the final bundle?

docs/bundler/index.md

@@ -651,6 +651,7 @@ The generated bundle will contain the following code:
 
 ```js
 console.log(process.env.FOO);
+console.log(process.env.ACME_PUBLIC_URL);
 console.log(process.env.BAZ);
 ```