Fix some typos

[riverzhang]

Release note:

[k8s-ci-robot]

Hi @riverzhang. 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 @k8s-bot 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]

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[k8s-reviewable]

This change is 

[dashpole]

@k8s-bot ok to test

[riverzhang]

I signed it!

[riverzhang]

/release-note-none

[riverzhang]

@k8s-bot unit test this

[riverzhang]

@k8s-bot gce etcd3 e2e test this

[dashpole]

/lgtm

[riverzhang]

@dchen1107

[riverzhang]

@yujuhong

[dchen1107]

/approve

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is APPROVED

The following people have approved this PR: dashpole, dchen1107, riverzhang

Needs approval from an approver in each of these OWNERS Files:

• pkg/kubelet/OWNERS [dchen1107]

You can indicate your approval by writing /approve in a comment
You can cancel your approval by writing /approve cancel in a comment

[k8s-github-robot]

Automatic merge from submit-queue (batch tested with PRs 41854, 41801, 40088, 41590, 41911)