Add @override annotation to known overriden methods

sky/sdk/example/widgets/styled_text.dart

Index: sky/sdk/example/widgets/styled_text.dart
diff --git a/sky/sdk/example/widgets/styled_text.dart b/sky/sdk/example/widgets/styled_text.dart
index c2d15922dc47278db12fcaa783c78afd90d4903a..46881bd4aec9f5a83126bb7bb9d05916d3c45909 100644
--- a/sky/sdk/example/widgets/styled_text.dart
+++ b/sky/sdk/example/widgets/styled_text.dart
@@ -49,7 +49,7 @@ HAL: This mission is too important for me to allow you to jeopardize it.''';
     decorationColor: const Color(0xFF000000),
     decorationStyle: TextDecorationStyle.wavy
   );
-  
+
   Component toStyledText(String name, String text) {
     TextStyle lineStyle = (name == "Dave") ? daveStyle : halStyle;
     return new StyledText(
@@ -78,6 +78,7 @@ HAL: This mission is too important for me to allow you to jeopardize it.''';
     });
   }
 
+  @override
   Widget build() {
     List<Component> lines = nameLines
       .map((nameAndText) => Function.apply(toText, nameAndText))