docs: fix retrieve order by display ID code block

[shahednasser]

Fixes #5099

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Name	Status	Preview	Comments	Updated (UTC)
api-reference	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 18, 2023 7:39am
medusa-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 18, 2023 7:39am