Docs: remove an outdated TypeScript-related note

[MidnightDesign]

Maybe this was changed at some point in TypeScript.

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[iansu]

Do you have a reference to where this was fixed?

[MidnightDesign]

Nope, I couldn't find anything. I just didn't get the error. You will get the error if you create a .ts file with no imports and no exports. But as soon as the file has at least one import (but no exports) it's gone. So I'm guessing this is something that behaved differently at some point.

[stale]

This pull request has been automatically marked as stale because it has not had any recent activity. It will be closed in 5 days if no further activity occurs.

[iansu]

Thanks!