services: docker: Fix service definition.

This commit follows a404716d41.

* gnu/services/docker.scm
(docker-configuration)[docker-cli]: New record field.
(docker-service-type): Use this.
* doc/guix.texi (Miscellaneous Services)[Docker Service]: Document this.

doc/guix.texi

@@ -27990,7 +27990,10 @@ This is the data type representing the configuration of Docker and Containerd.
 @table @asis
 
 @item @code{package} (default: @code{docker})
-The Docker package to use.
+The Docker daemon package to use.
+
+@item @code{package} (default: @code{docker-cli})
+The Docker client package to use.
 
 @item @code{containerd} (default: @var{containerd})
 The Containerd package to use.

gnu/services/docker.scm

@@ -45,6 +45,9 @@
   (docker
    (package docker)
    "Docker daemon package.")
+  (docker-cli
+   (package docker-cli)
+   "Docker client package.")
   (containerd
    (package containerd)
    "containerd package.")
@@ -136,7 +139,7 @@ bundles in Docker containers.")
                  (list
                   ;; Make sure the 'docker' command is available.
                   (service-extension profile-service-type
-                                     (compose list docker-cli))
+                                     (compose list docker-configuration-docker-cli))
                   (service-extension activation-service-type
                                      %docker-activation)
                   (service-extension shepherd-root-service-type