document Spotlight shadow map sizing (#20282)

This resource controls both, but its not documented. Document it

Author: atlv24

crates/bevy_light/src/directional_light.rs

@@ -169,7 +169,7 @@ pub struct DirectionalLightTexture {
     pub tiled: bool,
 }
 
-/// Controls the resolution of [`DirectionalLight`] shadow maps.
+/// Controls the resolution of [`DirectionalLight`] and [`SpotLight`](crate::SpotLight) shadow maps.
 ///
 /// ```
 /// # use bevy_app::prelude::*;

crates/bevy_light/src/spot_light.rs

@@ -17,6 +17,8 @@ use crate::cluster::{ClusterVisibilityClass, GlobalVisibleClusterableObjects};
 /// Behaves like a point light in a perfectly absorbent housing that
 /// shines light only in a given direction. The direction is taken from
 /// the transform, and can be specified with [`Transform::looking_at`](Transform::looking_at).
+///
+/// To control the resolution of the shadow maps, use the [`crate::DirectionalLightShadowMap`] resource.
 #[derive(Component, Debug, Clone, Copy, Reflect)]
 #[reflect(Component, Default, Debug, Clone)]
 #[require(Frustum, VisibleMeshEntities, Transform, Visibility, VisibilityClass)]