Fix invalid TypeScript annotation

[isarikaya]

Summary

This update fixes an incorrect TypeScript annotation used inside a JavaScript code example. The expression let modelUsed: string = "" has been corrected to let modelUsed = "" to match standard JavaScript syntax and improve accuracy for developers following the documentation.

Screenshots (optional)

N/A

Documentation checklist

• Is there a changelog entry?
• The change adheres to the documentation style guide.
• If a larger change, an issue has been opened related to incorrect or outdated information.
• Files which have changed name or location have been allocated redirects.