Add trailing comma to TypeScript interface definition

[mavci42]

This PR adds missing trailing commas to the TypeScript interface definition in the documentation. Adding trailing commas is considered a best practice in TypeScript for several reasons:

1. Consistency: Maintains a consistent code style throughout the codebase.
2. Cleaner diffs: When new properties are added in the future, git diffs will only show the new line, not modifications to existing lines.
3. Error prevention: Helps prevent errors when converting between different formats (like TS to JSON).
4. Maintainability: Makes code easier to refactor and modify in the future.