Update AdvancedUsage.md

[GlebkaF]

If used as described in the current documentation, codeception throws an error

In Step.php line 44:
                                                                               
  Codeception\Step::__construct(): Argument #2 ($arguments) must be of type a  
  rray, string given, called in /opt/app/vendor/codeception/codeception/src/C  
  odeception/Test/Cest.php on line 89       

But it would be great if it could work without additional parentheses.

[Arhell]

@Naktibalda
Please take a look when you have time, thanks

[W0rma]

This PR can be closed if Codeception/Codeception#6812 is accepted because it adjusts the implementation to the documented behavior.