RLS11 — Service::connect() confusion

As for Service::connect() method, difference of two connect() methods are not clearly described, and developers can be very confused. The notations IN service and OUT service is confusing. Given a relation A->B, which one is IN service? Receiver(IN) / Sender(OUT) would be more clear conceptually.

As described, the difference of the two connect() methods are in which side
initiates the connection. The notation ‘receiver’ and ‘sender’ is, as suggested,
much clear. Thus, change ‘IN service’ as ‘RECEIVER service’ and ‘OUT service’
as ‘SENDER service’.