Rustfmt police

examples/3d/mixed_lighting.rs

@@ -58,7 +58,7 @@ enum LightingMode {
 }
 
 /// An event that's fired whenever the user changes the lighting mode.
-/// 
+///
 /// This is also fired when the scene loads for the first time.
 #[derive(Clone, Copy, Default, Event)]
 struct LightingModeChanged;