Add alternative podman command for memory info

[aressem]

I confirm that this contribution is made under the terms of the license found in the root directory of this repository's source tree and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[thomasht86]

Great! Think we should probably add this to the example notebooks running docker as well, but this is a good start.

[thomasht86]

I can update the broken link
Seems like
https://docs.vespa.ai/en/reference/indexing-language-reference.html#converter ->
https://docs.vespa.ai/en/reference/indexing-language-reference.html#converters

[thomasht86]

I am working on fixing the notebook tests in another branch, so we can just merge this after re-approval