Updates on cli reference documentation

- Update ps with `--last` flag
- Update commands with current output
- Make sure hugo does not detect the wrong language
- Update usage for `tag` command to be more coherent with the other ones

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

docs/reference/commandline/service_scale.md

@@ -11,13 +11,14 @@ parent = "smn_cli"
 
 # service scale
 
-    Usage:	docker service scale SERVICE=REPLICAS [SERVICE=REPLICAS...]
+```markdown
+Usage:  docker service scale SERVICE=REPLICAS [SERVICE=REPLICAS...]
 
-    Scale one or multiple services
-
-    Options:
-          --help   Print usage
+Scale one or multiple services
 
+Options:
+      --help   Print usage
+```
 
 ## Examples