Update service inspect --pretty reference docs

Update the output and fix wrong usage in a tutorial page.

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

docs/reference/commandline/service_inspect.md

@@ -119,14 +119,11 @@ Labels:
 Mode:		REPLICATED
  Replicas:		5
 Placement:
- Strategy:	Spread
 UpdateConfig:
  Parallelism:	0
 ContainerSpec:
  Image:		nginx:alpine
 Resources:
-Reservations:
-Limits:
 Ports:
  Name =
  Protocol = tcp