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Clarify comment about camera coordinate system (#13056)

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# Objective

Clarify the comment about the camera's coordinate system in
`examples/3d/generate_custom_mesh.rs` by explicitly stating which axes
point where.
Fixes #13018

## Solution

Copy the wording from #13012 into the example.
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examples/3d/generate_custom_mesh.rs
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@ -122,7 +122,8 @@ fn create_cube_mesh() -> Mesh {
Mesh::new(PrimitiveTopology::TriangleList, RenderAssetUsages::MAIN_WORLD | RenderAssetUsages::RENDER_WORLD) Mesh::new(PrimitiveTopology::TriangleList, RenderAssetUsages::MAIN_WORLD | RenderAssetUsages::RENDER_WORLD)
.with_inserted_attribute( .with_inserted_attribute(
Mesh::ATTRIBUTE_POSITION, Mesh::ATTRIBUTE_POSITION,
// Each array is an [x, y, z] coordinate in local space. Bevy uses a right-handed Y-up coordinate system. // Each array is an [x, y, z] coordinate in local space.
// The camera coordinate space is right-handed x-right, y-up, z-back. This means "forward" is -Z.
// Meshes always rotate around their local [0, 0, 0] when a rotation is applied to their Transform. // Meshes always rotate around their local [0, 0, 0] when a rotation is applied to their Transform.
// By centering our mesh around the origin, rotating the mesh preserves its center of mass. // By centering our mesh around the origin, rotating the mesh preserves its center of mass.
vec![ vec![