Nit: fix typos

[ialidzhikov]

What type of PR is this?
/kind documentation

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

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @ialidzhikov. Thanks for your PR.

I'm waiting for a kubernetes-csi 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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[xing-yang]

We can't directly modify changes under release-tools. Please fix them in this repo: https://github.com/kubernetes-csi/csi-release-tools instead. All changes under release-tools are imported from csi-release-tools repo like this: #301

[xing-yang]

/ok-to-test

[yuxiangqian]

/lgtm

[yuxiangqian]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ialidzhikov, yuxiangqian

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