fixed dart formatting

public/docs/dart/latest/quickstart.jade

@@ -22,7 +22,7 @@ p.
   p.
     In <code>pubspec.yaml</code>, add the angular2 and browser packages as dependencies:
 
-  pre.prettyprint.linenums
+  pre.prettyprint.linenums.lang-basic
     code.
       name: hello_world
       version: 0.0.1
@@ -34,7 +34,7 @@ p.
     to install the angular2 and browser packages
     (along with the packages they depend on):
 
-  pre.prettyprint
+  pre.prettyprint.lang-basic
     code.
       &gt; pub get
       Resolving dependencies... (7.3s)