fix inconsistency for

Signed-off-by: yuexiao-wang <wang.yuexiao@zte.com.cn>

docs/reference/commandline/service.md

@@ -28,7 +28,7 @@ Commands:
   inspect     Display detailed information on one or more services
   logs        Fetch the logs of a service
   ls          List services
-  ps          List the tasks of a service
+  ps          List the tasks of one or more services
   rm          Remove one or more services
   scale       Scale one or multiple replicated services
   update      Update a service

docs/reference/commandline/service_ps.md

@@ -17,7 +17,7 @@ aliases: ["/engine/reference/commandline/service_tasks/"]
 # service ps
 
 ```Markdown
-Usage:  docker service ps [OPTIONS] SERVICE
+Usage:  docker service ps [OPTIONS] SERVICE [SERVICE...]
 
 List the tasks of one or more services
 
@@ -147,12 +147,10 @@ ID            NAME      IMAGE        NODE      DESIRED STATE  CURRENT STATE
 8eaxrb2fqpbn  redis.10  redis:3.0.6  manager1  Running        Running 8 seconds
 ```
 
-
 #### desired-state
 
 The `desired-state` filter can take the values `running`, `shutdown`, and `accepted`.
 
-
 ### Formatting
 
 The formatting options (`--format`) pretty-prints tasks output
@@ -176,7 +174,7 @@ output the data exactly as the template declares or, when using the
 `table` directive, includes column headers as well.
 
 The following example uses a template without headers and outputs the
-`ID` and `Driver` entries separated by a colon for all tasks:
+`Name` and `Image` entries separated by a colon for all tasks:
 
 ```bash
 $ docker service ps --format "{{.Name}}: {{.Image}}" top