Clarify Section 6.6.3 regarding singletons

The section 6.6.3 Passivation capable dependencies states:

all singleton beans are passivation capable dependencies

Clearly the specification intents to address singleton session beans but the current wording does not make that explicit and users confuse this line and consider javax.inject.Singleton-scoped beans also to be passivation capable dependencies.

The spec should instead say that:

all singleton session beans are passivation capable dependencies