docs(core): SpatialIndex index entities with the Spatial component (#743)

Author: andrewgazelka

crates/spatial/src/lib.rs

@@ -23,7 +23,7 @@ pub struct SpatialModule;
 
 #[derive(Component, Debug, Default)]
 pub struct SpatialIndex {
-    /// The bounding boxes of all players
+    /// The bounding boxes of all entities with the [`Spatial`] component
     query: bvh_region::Bvh<Entity>,
 }