Animation behaviour help icon leads to broken 404 documentation page

Steps to reproduce:

1. Create a new project
2. Add a cube in the Hierarchy window
3. Select a cube and create an animation for it (Window -> Animation -> Animation -> Click "Create" button -> enter animation name -> click Save)
4. Close the Animation window
5. Open the "Animator" window (Window ->Animation -> Animator)
6. Select the animation object in the Animator window
7. Go to the Inspector window
8. Click "Add Behaviour -> New Script"
9. Enter the name and click "Create and Add"
10. Click next to the script title
11. Observe the result

Actual results: User gets "Sorry... that page seems missing"

Expected results: The corresponding page should be opened

Reproducible with versions: 6000.6.0a7, 6000.5.0b12, 6000.4.10f1, 6000.3.17f1, 6000.0.76f1

Not reproducible with versions: 

Tested on (OS): macOS - Tahoe 26.5