angular.dart -> angular2.dart in quickstart text

typo caught by reviewer

Author: kwalrath

public/docs/dart/latest/quickstart.jade

@@ -87,16 +87,16 @@ p.
       The main Dart file for any Angular 2 app must import
       <code>'package:angular2/bootstrap.dart'</code>.
       If you put part of your app into one or more additional libraries,
-      those additional libraries must import <code>angular.dart</code>
+      those additional libraries must import <code>angular2.dart</code>
       instead of <code>bootstrap.dart</code>,
 
     p.
-      The <code>bootstrap.dart</code> and <code>angular.dart</code> files
+      The <code>bootstrap.dart</code> and <code>angular2.dart</code> files
       provide the same API,
       except that <code>bootstrap.dart</code> also provides a
       <code>bootstrap()</code> function, which you'll see a little later.
       For <a href="#performance">performance reasons</a>,
-      use <code>angular.dart</code> whenever possible.
+      use <code>angular2.dart</code> whenever possible.
 
   h2#section-angular-create-account 3. Define a component
 
@@ -301,7 +301,7 @@ p.
       so that they don't use mirrors.
       The transformer doesn't convert other libraries in your app,
       so be sure to
-      import <code>angular.dart</code> instead of <code>bootstrap.dart</code>
+      import <code>angular2.dart</code> instead of <code>bootstrap.dart</code>
       in any libraries you create that use Angular 2
       but don't call <code>bootstrap()</code>.