Unclear separation of "Private types"

It took me a long time to see "Private types" in the righthand sidebar of https://svelte.dev/docs/kit/@sveltejs-kit. I got really confused that I couldn't find RequestEvent right above RequestOptions and thought it was missing from the side nav. If I didn't already know it was on the page I wouldn't have found it. That's how I eventually saw there's a separate "Private types" section