this sentence is not needed, as this article is telling about it. Because it's a caution block, I prefer to have something like:

````rst
You may receive a :class:`Symfony\\....\\ScopeWideningInjectionException` when
passing the ``request`` service as an argument. To understand this problem better
and leran how to solve it, refer to the cookbook article
:doc:`/cookbook/service_container/scope`
````

(please note that the api link for the exception class is not correct right now)