fix articles

Author: milkie

source/reference/server-sessions.txt

@@ -46,11 +46,11 @@ session.
 
 If the deployment does not enforce authentication/authorization, a
 created session has no owner and can be used by any user on any
-connection. If the user authenticates and creates a session for a
-deployment that does not enforce authentication/authorization, the user
+connection. If a user authenticates and creates a session for a
+deployment that does not enforce authentication/authorization, that user
 owns the session. However, any user on any connection may use the
 session.
 
-If the deployment transitions to auth without any downtime, any
+If the deployment transitions to authentication without any downtime, any
 sessions without an owner cannot be used.