minor clarification

engine/game.go

@@ -25,7 +25,7 @@ type Builder interface {
 
 // Scanner components can be scanned. It is called when the game tree is walked
 // (such as when the game component database is constructed).
-// Scan should return a slice containing all subcomponents.
+// Scan should return a slice containing all immediate subcomponents.
 type Scanner interface {
 	Scan() []interface{}
 }

engine/scene.go

@@ -64,7 +64,7 @@ func (s *Scene) sortByZ() {
 	})
 }
 
-// Scan returns all subcomponents.
+// Scan returns all immediate subcomponents.
 func (s *Scene) Scan() []interface{} { return s.Components }
 
 // Update calls Update on all Updater components.