fix code highlighting in concepts-models.md

[BartekSTRX]

fix code highlighting - currently highlighted lines of code are out of sync with linked files

pics below show how it looks before the changes

[prmerger-automator]

@BartekSTRX : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[BartekSTRX]

Relevant file: https://github.com/Azure-Samples/azure-digital-twins-getting-started/blob/main/models/advanced-home-example/IRoom.json

[learn-build-service-prod]

Learn Build status updates of commit f6fab35:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/digital-twins/concepts-models.md	✅Succeeded

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[Jak-MS]

@baanders
Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[baanders]

Thank you @BartekSTRX for noticing that the highlights have become out-of-sync with the referenced IRoom.json file, and for taking the time to provide these updates!

I've requested some changes to your edits with explanations in the review comments. Please take a look at my review and let me know if you have any questions. Once they are addressed, we can merge this PR into main. :)

[BartekSTRX]

@baanders all looks good, I think it can be merged

[baanders]

Hi @BartekSTRX, thank you for reviewing my comments! In order to merge this pull request, you'll need to implement the requsted changes by adding a new commit.
Alternatively, I can make the updates myself in a separate PR and close this one if that is easier for you. :)