Remove double kubectl from deprecation warning

[mortenhauberg]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
Running kubectl exec -ti POD_NAME command will yield a deprecation warning.
The warning contains the word kubectl twice.

kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl kubectl exec [POD] -- [COMMAND] instead.

It's really a minor thing 🤷🏼‍♂️

NONE

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Hi @mortenhauberg. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mortenhauberg]

/assign @apelisse

[rikatz]

/ok-to-test

[apelisse]

/lgtm
/approve

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: apelisse, mortenhauberg

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[mortenhauberg]

/retest

[k8s-ci-robot]

@mortenhauberg: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-kubernetes-node-e2e-containerd	5fe57c6	link	/test pull-kubernetes-node-e2e-containerd

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[fejta-bot]

/retest
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[fejta-bot]

/retest
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Review the full test history for this PR.

Silence the bot with an /lgtm cancel or /hold comment for consistent failures.