Add missing 'kubectl` prefix to krew command

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[Jaanki]

/assign Jaanki

[ahmetb]

/lgtm /approve Thanks!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahmetb, Jaanki

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/krew/blob/master/OWNERS)~~ [ahmetb] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment