Merge pull request #1164 from kwalrath/hdi-dds

docs(dart): proposed text for linking to Dart samples

Author: thso

public/docs/dart/latest/guide/hierarchical-dependency-injection.jade

@@ -12,8 +12,8 @@ include ../_util-fns
 
   In this chapter we explore these points and write some code.
 
-  The source code for the example app in this chapter is 
-  [in GitHub](https://github.com/angular/angular.io/tree/master/public/docs/_examples/hierarchical-dependency-injection/dart).
+  [Run the live example](https://angular-examples.github.io/hierarchical-dependency-injection/) |
+  [View its source code](https://github.com/angular-examples/hierarchical-dependency-injection)
 
 .l-main-section
 :marked