How to reproduce:
1. Create a new URP 2D project
2. In the Hierarchy, right-click -> Create Empty
3. Select the created GameObject
4. In the Inspector, click "Add Component" -> Limb Solver 2D
5. Click on the "?" button to open the documentation and observe the results

Expected results: The documentation opens
Actual results: The documentation is missing

Reproducible with: 6000.0.65f1, 6000.3.3f1, 6000.4.0b3, 6000.5.0a3

Reproducible on: macOS Tahoe 26
Not reproducible on: No other environment tested