Fixing 'docker stack services' command syntax
Fixing 'docker stack services' command syntax

The argument regarding the stack ('vote', in the example) was missing. Without it, the following error message was being displayed:
```
"docker stack services" requires exactly 1 argument(s).
See 'docker stack services --help'.

Usage:  docker stack services [OPTIONS] STACK

List the services in the stack
```
ManoMarks/labs,ManoMarks/labs,ManoMarks/labs,ManoMarks/labs,ManoMarks/labs,ManoMarks/labs,ManoMarks/labs,ManoMarks/labs