docker/podman documentation updates
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virt-docker(1): Mention how to generate images locally
Some developers prefer not to trust docker.io, which is a third-party service. We already mentioned this mode in the a-b-docker man page, but not in a-v-docker.
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build-docker: Consistently use podman in examples
We're recommending podman over docker as being able to run without root-equivalence, so let's use commands that an unprivileged user can run without modification.
/cc @elbrus