Update example on position-try-order

### MDN URL

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/position-try-order

### What specific section or headline is this issue about?

Examples

### What information was incorrect, unhelpful, or incomplete?

This is a follow up to https://github.com/mdn/content/issues/42749

Once the functionality discussion has been concluded we can update the example

From previous issue

> I wanted to update the example on the position-try-order page but the way it works is https://github.com/w3c/csswg-drafts/issues/13268

Open the MDN page and inspect the Examples section, then read follow-up issue #42749 and CSSWG issue #13268 for the unresolved functionality discussion. Once that discussion is concluded, update the example to reflect the agreed behavior and verify the rendered documentation example.

Written by the indexing model from the issue text.