Add missing docs

Author: Jondolf

crates/bevy_render/src/mesh/shape/sphere.rs

@@ -10,9 +10,12 @@ use wgpu::PrimitiveTopology;
 /// An error when creating an icosphere [`Mesh`] from a [`SphereMesh`].
 #[derive(Clone, Copy, Debug, Error)]
 pub enum IcosphereError {
+    /// The icosphere has too many vertices.
     #[error("Cannot create an icosphere of {subdivisions} subdivisions due to there being too many vertices being generated: {number_of_resulting_points}. (Limited to 65535 vertices or 79 subdivisions)")]
     TooManyVertices {
+        /// The number of subdivisions used. 79 is the largest allowed value for a mesh to be generated.
         subdivisions: usize,
+        /// The number of vertices generated. 65535 is the largest allowed value for a mesh to be generated.
         number_of_resulting_points: usize,
     },
 }