Open Reference Button (?) goes to "Sorry... that page seems to be missing!" page

1. Create an empty scene
2. In the Hierarchy window, right click "Create Empty"
3. In the Inspector window, click on "Add Component"
4. Choose "Cesium > Cesium 3D Tileset"
5. On the right side of your new component, click the ? button (Open reference for ...)

Notice: It will open a page that says "Sorry... that page seems to be missing!"

(other cesium scripts exhibit this same behavior, could be all of them)

This appears like a link is broken. If we don't have any script documentation yet, I would expect to land on a page that states this, or at least go to the unity guide (https://cesium.com/learn/unity/)

Start from the Cesium 3D Tileset component in the Unity Inspector and trace the URL opened by its ? button. Check whether the reference URL resolves, and compare it with the other Cesium scripts mentioned in the report. Done means the button no longer opens a missing page and reaches available documentation or the Unity guide.

Written by the indexing model from the issue text.