Value ('green') is used in place of key ('color') in action declaration.

Author: mgiagnoni

book/controller.rst

@@ -430,7 +430,7 @@ method becomes the arguments on the resulting controller. This same interface
 is used when embedding controllers into templates (see :ref:`templating-embedding-controller`).
 The target controller method should look something like the following::
 
- public function fancyAction($name, $green)
+ public function fancyAction($name, $color)
  {
  // ... create and return a Response object
  }