Add note to SphereMesh's radius pointing to the height property

[aflorea-2k]

Your Godot version: 4.5.1.stable

Issue description: When using SphereShape3D, the radius property relates to the radius of the whole sphere. When using SphereMesh however, the radius property relates to the radius of the sphere's equator. The height property handles, well the sphere's height.

As you may have guessed, when creating a sphere programmatically, my mesh was squished, since I'd handled my SphereMesh the way I'd handle a SphereShape3D

I wanted to add a small line to SphereMesh.radius's description: "See also [member height]", or "[b]Note:[/b] to get a regular sphere, radius must be equal to half of [member height]".

Before making a PR with this change, I wanted first to run it by someone with more experience to know if it would be appreciated, or rather be deemed as unnecessary.

URL to the documentation page (if already existing): SphereMesh SphereShape3D

[kleonc]

I agree it might be confusing/surprising (you're a living proof🙃). A PR clarifying this would be welcomed! Changing "radius of the sphere" to "radius of the sphere's equator" also makes sense to me (or maybe to "horizontal radius of the sphere"? 🤔).