How to reproduce:
1. Open the user-submitted Project
2. In the Project Window click on the "New Custom Render Texture"
3. In the Inspector Window press the blue documentation button to be directed to its reference page
4. Observe the error message

Expected result: The documentation button directs to the correct reference page
Actual result: The documentation button directs to a dead link (https://docs.unity3d.com/Manual/class-CustomRenderTexture.html)

Reproduced in: 2019.1.0a2, 2018.3.0b3, 2018.2.9f1, 2018.1.9f2, 2017.4.11f1