services: Add missing 'description' fields.

* gnu/services/databases.scm (postgresql-service-type)[description]: New field.
(memcached-service-type)[description]: New field.
(mysql-service-type)[description]: New field.
(redis-service-type)[description]: New field.
* gnu/services/desktop.scm (geoclue-service-type)[description]: New
field.
(udisks-service-type)[description]: New field.
(elogind-service-type)[description]: New field.
(account-service-type)[description]: New field.
* gnu/services/kerberos.scm (krb5-service-type)[description]: New field.
(pam-krb5-service-type)[description]: New field.
* gnu/services/lirc.scm (lirc-service-type)[description]: New field.
* gnu/services/mail.scm (dovecot-service-type)[description]: New field.
(opensmtpd-service-type)[description]: New field.
(mail-aliases-service-type)[description]: New field.
(exim-service-type)[description]: New field.
* gnu/services/monitoring.scm (zabbix-server-service-type)[description]:
New field.
(zabbix-agent-service-type)[description]: New field.
* gnu/services/nfs.scm (rpcbind-service-type)[description]: New field.
(pipefs-service-type)[description]: New field.
(gss-service-type)[description]: New field.
(idmap-service-type)[description]: New field.
* gnu/services/spice.scm (spice-vdagent-service-type)[description]: New field.
* gnu/services/sysctl.scm (sysctl-service-type)[description]: New field.
* gnu/services/virtualization.scm (libvirt-service-type)[description]:
New field.
(virtlog-service-type)[description]: New field.
* gnu/services/vpn.scm (openvpn-server-service-type)[description]: New field.
(openvpn-client-service-type)[description]: New field.
(wireguard-service-type)[description]: New field.
* gnu/services/web.scm (httpd-service-type)[description]: New field.
(fcgiwrap-service-type)[description]: New field.
(agate-service-type)[description]: New field.
[name]: Fix.

1 files changed, 7 insertions, 2 deletions

diff --git a/gnu/services/monitoring.scm b/gnu/services/monitoring.scm
index 0e6aed2cac..9c8704092c 100644
--- a/gnu/services/monitoring.scm
+++ b/gnu/services/monitoring.scm
@@ -419,7 +419,10 @@ configuration file."))
                              zabbix-server-account)
           (service-extension activation-service-type
                              zabbix-server-activation)))
-   (default-value (zabbix-server-configuration))))
+   (default-value (zabbix-server-configuration))
+   (description "Run the Zabbix server, a high-performance monitoring system
+that can collect data about machines from a variety of sources and provide the
+results in a Web interface.")))
 
 (define (generate-zabbix-server-documentation)
   (generate-documentation
@@ -546,7 +549,9 @@ configuration file."))
                              zabbix-agent-account)
           (service-extension activation-service-type
                              zabbix-agent-activation)))
-   (default-value (zabbix-agent-configuration))))
+   (default-value (zabbix-agent-configuration))
+   (description "Run the Zabbix agent, @command{zabbix_agentd}, which gathers
+information about the running system for the Zabbix monitoring server.")))
 
 (define (generate-zabbix-agent-documentation)
   (generate-documentation