podman docs versions out of sync

`podman machine init` doesn't support the `--volume` flag anymore, but it's still on the [latest docs](https://docs.podman.io/en/latest/markdown/podman-machine-init.1.html#volume-v-source-target).


Going to the latest version [(3.4.4)](https://docs.podman.io/en/v3.4.4/markdown/podman-machine-init.1.html) explicitly shows the correct docs, without the `--volume` flag.

Looks like the docs are here https://github.com/containers/podman/tree/main/docs, but I figured it'd make more sense to post the issue in this repo since it's related to docs and the podman repo only has 2 categories for issues: bug and feature. This is neither a bug with podman nor a feature request.

I'd guess it's is just a readthedocs/sphinx config issue.

Start by comparing the latest and v3.4.4 pages for podman machine init and then inspect the documentation configuration in the podman.io repository, especially the docs path referenced in the issue. Done means the latest documentation no longer lists the unsupported --volume flag while the versioned documentation remains correct.

Written by the indexing model from the issue text.