Fix issues that broke editing on browsers without Shadow DOM support.

dart/site/try/src/editor.dart

Index: dart/site/try/src/editor.dart
diff --git a/dart/site/try/src/editor.dart b/dart/site/try/src/editor.dart
index 615a8539aec63a83cf4fbb88e6228b433286dce3..b4357789182892afe3f0be853d81913dde0f65fd 100644
--- a/dart/site/try/src/editor.dart
+++ b/dart/site/try/src/editor.dart
@@ -274,6 +274,6 @@ diagnostic(text, tip) {
   }
   return new AnchorElement()
       ..classes.add('diagnostic')
-      ..append(text)
-      ..append(tip);
+      ..append(tip)
+      ..append(text);
 }