Fix typos in fn3

examples/widgets/styled_text.dart

@@ -12,6 +12,7 @@ class StyledTextApp extends StatefulComponent {
 
 class StyledTextAppState extends State<StyledTextApp> {
   void initState(BuildContext context) {
+    super.initState(context);
     toText = toStyledText;
     nameLines = dialogText
       .split('\n')

packages/flutter/lib/src/fn3/basic.dart

@@ -530,7 +530,7 @@ class Flex extends MultiChildRenderObjectWidget {
   final FlexAlignItems alignItems;
   final TextBaseline textBaseline;
 
-  RenderFlex createRenderObject() => new RenderFlex(direction: direction);
+  RenderFlex createRenderObject() => new RenderFlex(direction: direction, justifyContent: justifyContent, alignItems: alignItems, textBaseline: textBaseline);
 
   void updateRenderObject(RenderFlex renderObject, Flex oldWidget) {
     renderObject.direction = direction;