fixed link for AcceptanceTest Selenuim Webdriver

tests/codeception/acceptance.suite.yml

@@ -13,7 +13,7 @@ modules:
     enabled:
         - PhpBrowser
 # you can use WebDriver instead of PhpBrowser to test javascript and ajax.
-# This will require you to install selenium. See http://codeception.com/docs/04-AcceptanceTests#Selenium
+# This will require you to install selenium. See http://codeception.com/docs/03-AcceptanceTests#selenium-webdriver
 # "restart" option is used by the WebDriver to start each time per test-file new session and cookies,
 # it is useful if you want to login in your app in each test.
 #        - WebDriver