Clarify Producers for injection into generic types

There is a discussion over in DeltaSpike whether an injection point

@Inject
private JsfMessage<SomeMessageClass>;

with a producer method

@Produces @Dependent
JsfMessage createMessage(InjectionPoint ip)

5.2 imo only defines the other way around. Having a raw type at the injection point and a parameterized producer method.
We should define how this is intended to work.
Please note that the producer above works in all existing containers so far but not in Weld2-beta1.

Here is the link to the DS issue: https://issues.apache.org/jira/browse/DELTASPIKE-295