fix up typo

[Aresforchina]

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @Aresforchina. 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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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Aresforchina
To complete the pull request process, please assign tstromberg
You can assign the PR to them by writing /assign @tstromberg in a comment when ready.

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[minikube-bot]

Can one of the admins verify this patch?

[tanjunchen]

/ok-to-test
@Aresforchina Thanks

[tstromberg]

Thank you!