docs(quickstart): tweak for Dart - don't suggest editing example

Until we have dartpad working, don't suggest editing the example.

Author: chalin

public/docs/ts/_cache/quickstart.jade

@@ -23,12 +23,12 @@ block includes
   The message starts with "Hello" and ends with `{{name}}`,
   which is an Angular [interpolation binding](guide/displaying-data.html) expression.
   At runtime, Angular replaces `{{name}}` with the value of the component's `name` property.
-
-  In the example, change the component class's `name` property from `'Angular'` to `'World'` and see what happens.
-
   Interpolation binding is one of many Angular features you'll discover in this documentation.
 
 +ifDocsFor('ts')
+  :marked
+    In the example, change the component class's `name` property from `'Angular'` to `'World'` and see what happens.
+
   .callout.is-helpful
     header A word about TypeScript
     p.

public/docs/ts/latest/quickstart.jade

@@ -23,12 +23,12 @@ block includes
   The message starts with "Hello" and ends with `{{name}}`,
   which is an Angular [interpolation binding](guide/displaying-data.html) expression.
   At runtime, Angular replaces `{{name}}` with the value of the component's `name` property.
-
-  In the example, change the component class's `name` property from `'Angular'` to `'World'` and see what happens.
-
   Interpolation binding is one of many Angular features you'll discover in this documentation.
 
 +ifDocsFor('ts')
+  :marked
+    In the example, change the component class's `name` property from `'Angular'` to `'World'` and see what happens.
+
   .callout.is-helpful
     header A word about TypeScript
     p.