Update reference docs for service ps
commit
changed the output format of `docker service ps`.
this patch updates the reference docs
to match the updated output format.
@@ -534,9 +534,11 @@ service's name and the node's ID where it sits.
```bash
$ docker service create --name hosttempl --hostname={% raw %}"{{.Node.ID}}-{{.Service.Name}}"{% endraw %} busybox top
va8ew30grofhjoychbr6iot8c
+
$ docker service ps va8ew30grofhjoychbr6iot8c
-NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
-hosttempl.1.wo41w8hg8qan busybox:latest@sha256:29f5d56d12684887bdfa50dcd29fc31eea4aaf4ad3bec43daf19026a7ce69912 2e7a8a9c4da2 Running Running about a minute ago
+ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
+wo41w8hg8qan hosttempl.1 busybox:latest@sha256:29f5d56d12684887bdfa50dcd29fc31eea4aaf4ad3bec43daf19026a7ce69912 2e7a8a9c4da2 Running Running about a minute ago
+
$ docker inspect --format={% raw %}"{{.Config.Hostname}}"{% endraw %} hosttempl.1.wo41w8hg8qanxwjwsg4kxpprj
x3ti0erg11rjpg64m75kej2mz-hosttempl
```
