small cleanup for `runc ps` man pages
runc ps - ps displays the processes running inside a container
# SYNOPSIS
- runc ps [command options] <container-id> [-- ps options]
+ runc ps [command options] <container-id> [ps options]
# OPTIONS
--format value, -f value select one of: table(default) or json
The default format is table. The following will output the processes of a container
in json format:
- # runc ps -f json
+ # runc ps -f json <container-id>
