Tweak lf/auth description in README (#181)

Signed-off-by: Herb Caudill <herb@devresults.com>

README.md

@@ -958,7 +958,7 @@ If many invocations are discharged during a session, the sender and receiver MAY
 
 [CACAO] is a translation of many of these ideas to a cross-blockchain invocation model. It contains the same basic concepts but is aimed at small messages and identities that are rooted in mutable documents rooted on a blockchain and lacks the ability to subdelegate capabilities.
 
-[Local-First Auth] uses CRDT-based ACLs and key lockboxes for role-based signatures. This is a non-certificate-based approach, instead of relying on the CRDT and signed data to build up a list of roles and members. It does have a very friendly invitation certificate mechanism in [Seitan token exchange]. It is also straightforward to see which users have access to what, avoiding the confinement problem seen in many decentralized auth systems.
+[Local-First Auth] is a non-certificate-based approach, instead relying on a CRDT to build up a list of group members, devices, and roles. It has a friendly invitation mechanism based on a [Seitan token exchange]. It is also straightforward to see which users have access to what, avoiding the confinement problem seen in many decentralized auth systems.
 
 [Macaroon] is a MAC-based capability and cookie system aimed at distributing authority across services in a trusted network (typically in the context of a Cloud). By not relying on asymmetric signatures, Macaroons achieve excellent space savings and performance, given that the MAC can be checked against the relevant services during discharge. The authority is rooted in an originating server rather than with an end-user.