Documentation Link does not work when the "TSS Theme File" question mark is clicked

Repo steps:

1. Open Unity Scene
2. Right click the project window 
3. Choose "create" > "UI Toolkit" > "TSS Theme File"
4. Click the "?" button in the inspector 
5. Web Page should open 

Expected Result: Documentation page with the data should be displayed for the user.

Actual Result: Web page displays "Sorry... that page seems to be missing!".

First noticed in: 

Reproducible with:  2020.3.46f1, 2021.3.21f1, 2022.2.12f1, 2023.1.0b9, 2023.2.0a8

Platforms tested: Win 11

Notes: