services: mail: Deprecate 'dovecot-service' procedure.

* doc/guix.texi (Mail Services): Replace 'dovecot-service' with 'dovecot-service-type'.
* gnu/services/mail.scm (dovecot-service-type): Set default value.
(dovecot-service): Deprecate procedure.
* gnu/tests/mail.scm (%dovecot-os): Use dovecot-service-type.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

1 files changed, 7 insertions, 6 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index dabd71f18c..af15894d49 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -24709,9 +24709,10 @@ in the subsections below.
 
 @subsubheading Dovecot Service
 
-@deffn {Scheme Procedure} dovecot-service [#:config (dovecot-configuration)]
-Return a service that runs the Dovecot IMAP/POP3/LMTP mail server.
-@end deffn
+@defvar dovecot-service-type
+Type for the service that runs the Dovecot IMAP/POP3/LMTP mail server,
+whose value is a @code{<dovecot-configuration>} object.
+@end defvar
 
 By default, Dovecot does not need much configuration; the default
 configuration object created by @code{(dovecot-configuration)} will
@@ -24726,9 +24727,9 @@ For example, to specify that mail is located at @code{maildir~/.mail},
 one would instantiate the Dovecot service like this:
 
 @lisp
-(dovecot-service #:config
-                 (dovecot-configuration
-                  (mail-location "maildir:~/.mail")))
+(service dovecot-service-type
+         (dovecot-configuration
+           (mail-location "maildir:~/.mail")))
 @end lisp
 
 The available configuration parameters follow.  Each parameter