DDSSEC12 — Authentication behavior use of built-in endpoints

In section 8.8.2.2, it's established that the BuiltinParticipantStatelessMessage built-in endpoints are used for exchanging the "authentication handshake" messages. This makes sense based on how those built-in endpoints are defined in 7.4.3 and how they're used in some parts of 8.3.2.9 and .11.

However there are parts of 8.3.2.11 and 8.8.2 that describe this handshake using the names BuiltinParticipantMessageWriter / Reader (note the absence of "Stateless"). The name BuiltinParticipantMessageWriter is defined by the RTPS spec as the endpoint used to implement the participant scoped liveliness (see RTPS 2.2 section 8.4.13.2).