Explain Physics Spiral of Death

[mrjustaguy]

Your Godot version:
4.3 Stable

Issue description:
Spiral of Death is mentioned in max physics step per frame documentation, but it's unclear what is ment by that.
It should clearly explain that it is a scenario when the Physics is taking more time to compute then the time that is allocated to a Physics Frame (like if it takes over 16.66 ms per frame at default 60hz physics tick rate)

URL to the documentation page (if already existing):
https://docs.godotengine.org/en/stable/classes/class_projectsettings.html#class-projectsettings-property-physics-common-max-physics-steps-per-frame
It should also be mentioned in https://docs.godotengine.org/en/stable/tutorials/performance/index.html as it can manifest as rapid, massive degradation of performance