How to reproduce:
1. Open the user's attached project
2. In the Project window, navigate to Assets/Shaders
3. Select the Shader Graph "TestShader1" and double-click to open it
4. In the newly opened Shader Graph tab, right-click either of the Nodes "Tangent", "Normal", "Position", or "Base Color"
5. Select "Open Documentation"

Expected result: web browser leads to a working Documentation link
Actual result: web browser leads to a missing Documentation link ("Sorry... that page seems to be missing!")

Reproducible with: 10.7.0 (2020.3.25f1), 12.1.2 (2021.2.7f1), 13.1.3 (2022.1.0b2)
Could not test with: 7.7.1 (2019.4.34f1) (ArgumentException: JSON parse error: The document root must not follow by other values.)