I am not sure if the doc is wrong or it has changed in the guix but the
definition of lsh service as it is at
http://www.gnu.org/software/guix/manual/html_node/Using-the-Configuration-System.html#Using-the-Configuration-System
(services (cons (lsh-service #:port 2222 #:allow-root-login? #t)
%base-services)))
is wrong, there should be
(services (cons (lsh-service #:port-number 2222 #:root-login? #t)
%base-services)))
at least this is how it works for me and conforms to:
http://www.gnu.org/software/guix/manual/html_node/Networking-Services.html#Networking-Services
regards
Adam Pribyl