a simpler way to explain Euler angles in the documentation

**Your Godot version:**
4.4.1

**Issue description:**
a video that recreates this practical and simple way to explain why pivot point is needed when working with Euler angles should be added to the docs

https://github.com/user-attachments/assets/b665dc23-3364-4f1e-a539-46a670100434

**URL to the documentation page (if already existing):**
https://docs.godotengine.org/en/stable/tutorials/3d/using_transforms.html