Fix typos.

[Chenditang]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Fix typos for stats_provider_test.go

Which issue(s) this PR fixes (optional, in fixes #(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):

Special notes for your reviewer:

Release note:

NONE

[k8s-ci-robot]

Hi @Chenditang. 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[krmayankk]

/ok-to-test

[krmayankk]

/lgtm

[ash2k]

/retest

[nikhita]

/assign @yujuhong
for approval

[yujuhong]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Chenditang, yujuhong

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