docs(docs/operations) Adding more steps to etcd-manager restore operation to work properly

[phspagiari]

This PR adds more steps to properly restore an etcd cluster using etcd-manager.

We faced this problem yesterday. When we do the restore, the backup brings back the old master endpoints. I thought the flag --endpoint-reconciler-type should get rid of it but doesn't.

In order to bring back the stability of our cluster we had to take these actions after the restore.

[k8s-ci-robot]

Hi @phspagiari. Thanks for your PR.

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[rifelpet]

Thank you, doc improvements are always appreciated!
/ok-to-test
/area documentation

[rifelpet]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: phspagiari, rifelpet

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