docs: Update typescript.mdx with fixed typo in isolatedModules example

[bodia-uz]

Summary

Fixes a typo in the tsconfig.json example for isolatedModules (for older typescript versions)

Related Links

Typo introduced in #5399

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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Pull Request Overview

Fixes a typo in the tsconfig.json example by replacing the incorrect verbatimModuleSyntax option with the proper isolatedModules setting.

• Corrects the compilerOptions key in the TypeScript guide example.

[chenjiahan]

Thank you!