Unify sample function in docs

Author: kwiatekus

docs/02-get-started/02-deploy-expose-function.md

@@ -20,17 +20,8 @@ First, let's create the Function and apply it.
 4. Name the Function `hello-world`.
 5. From the **Language** dropdown, choose `JavaScript`.
 6. From the **Runtime** dropdown, choose one of the available `nodejs`.
-7. Paste the following source code:
-```javascript
-module.exports = {
-  main: async function (event, context) {
-    const message = `Hello Serverless`
-    console.log(message);
-    return message;
-  }
-}
-```
-7. Click **Create**.
+7. Keep the sample function code.
+8. Click **Create**.
   </details>
   <details>
   <summary label="kubectl">