[pt-br] Update docs/setup/production-environment/tools/kubeadm/install-kubeadm.md

[ricardoamaro]

Per #44765 grabbed the https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/ and translated that to pt-br taking into account the already existing page.

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[edsoncelio]

/cc

[edsoncelio]

Hi,

A few minor issues to fix.
After that will be LGTM

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[edsoncelio]

PTAL @stormqueen1990

[stormqueen1990]

/retitle [pt-br] Update docs/setup/production-environment/tools/kubeadm/install-kubeadm.md

[ricardoamaro]

Obrigado pelo feedback @edsoncelio

[edsoncelio]

Hi Ricardo,
Just a few more changes before approve :)