Docs: groups/hgroups missing in podman-top documentation

https://github.com/containers/psgo/pull/88 added support for the `groups` and `hgroups` descriptors for `podman top`, but the matching [documentation ](https://github.com/containers/podman/blob/66954d7e7e579f905aeaa795eafa7d5ba432d131/docs/source/markdown/podman-top.1.md.in) does not list them.