Traits: not visible that a trait is used

[mbed67]

There was no example of a class that uses a trait in phpDocumentor, so it had to be simulated with a testclass. The trait that is used is vendor\symfony\dependency-injection\Symfony\Component\DependencyInjection\ContainerAwareTrait

This trait contains a property and a method. Both are visible in the documentation. But it isn't clear that a trait has been used.