Add Networks placeholder to ps --format
Passing {{.Networks}} to the format parameter will prompt ps to
display all the networks the container is connected to.
@@ -347,6 +347,7 @@ Placeholder | Description
`.Labels` | All labels assigned to the container.
`.Label` | Value of a specific label for this container. For example `'{% raw %}{{.Label "com.docker.swarm.cpu"}}{% endraw %}'`
`.Mounts` | Names of the volumes mounted in this container.
+`.Networks` | Names of the networks attached to this container.
When using the `--format` option, the `ps` command will either output the data
exactly as the template declares or, when using the `table` directive, includes
