Fix docker ps (#2196)

_data/engine-cli/docker_ps.yaml

@@ -354,6 +354,7 @@ examples: |-
   ```
 
   The following filter matches all containers that have exposed TCP port in the range of `8000-8080`:
+
   ```bash
   $ docker ps --filter expose=8000-8080/tcp
 
@@ -362,6 +363,7 @@ examples: |-
   ```
 
   The following filter matches all containers that have exposed UDP port `80`:
+
   ```bash
   $ docker ps --filter publish=80/udp