Update step_06.ngdoc

The code in the scenario.js don't work. With the test shows this message:

PhoneCat App Phone list view should render phone specific links
   Message:
     Error: No element found using locator: By.cssSelector(".phones li a")
   Stacktrace:
     Error: No element found using locator: By.cssSelector(".phones li a")


The correct versión is on github examples.