a simpler way to explain Euler angles in the documentation

[bookshelf-png]

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

euler.simple.mp4

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