services: shepherd: 'shepherd-service-type' requires documentation.

* gnu/services/shepherd.scm (shepherd-service-type): Require a
'description' form.
* gnu/services/base.scm (root-file-system-service-type)
(rngd-service-type, host-name-service-type):
(virtual-terminal-service-type, console-keymap-service-type)
(syslog-service-type, swap-service-type)
(kmscon-service-type): Add description.
* gnu/services/networking.scm (dhcp-client-service-type): Likewise.
* gnu/system/install.scm (cow-store-service-type): Likewise.
* gnu/system/linux-container.scm (dummy-networking-service-type):
Likewise.
* gnu/system/mapped-devices.scm (device-mapping-service-type):
Likewise.
* tests/guix-system.sh: Likewise.

1 files changed, 3 insertions, 2 deletions

diff --git a/tests/guix-system.sh b/tests/guix-system.sh
index f14c92ca758..e7e4c17e39f 100644
--- a/tests/guix-system.sh
+++ b/tests/guix-system.sh
@@ -1,5 +1,5 @@
 # GNU Guix --- Functional package management for GNU
-# Copyright © 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
+# Copyright © 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
 # Copyright © 2017 Tobias Geerinckx-Rice <me@tobias.gr>
 # Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
 #
@@ -204,7 +204,8 @@ cat > "$tmpfile" <<EOF
       (shepherd-service
         (provision '(buggy!))
         (requirement '(does-not-exist))
-        (start #t)))))
+        (start #t)))
+    (description "Buggy.")))
 
 (operating-system
   $OS_BASE