Update minikube.md

[italozaina]

This is the way that worked to me

[alanpoulain]

I think it would be better to refer to https://minikube.sigs.k8s.io/docs/handbook/pushing/ instead.

[italozaina]

Already has a reference to the documentation("If you use Mac or Windows, refer to the documentation to learn how to expose") in the tutorial that does not maintain a cohesive understanding of step-by-step, I believe that this way will be more accurate.

[alanpoulain]

You are in the context of pushing a Docker image, it makes sense to refer to the corresponding documentation on the Minikube website instead of duplicating its content. It's also easier to maintain it, since it's not our responsibilities to update the documentation if Minikube changes its way of doing it.