Fix a typo in cmd/kube-apiserver.

[jiachengxu]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Fix a typo in cmd/kube-apiserver: oppurtunity -> opportunity

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

NONE

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[k8s-ci-robot]

Hi @jiachengxu. Thanks for your PR.

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[jiachengxu]

/assign @mml

[nikhita]

/lgtm
/ok-to-test

[nikhita]

/kind cleanup

[liggitt]

/approve
/priority backlog

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jiachengxu, liggitt

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Needs approval from an approver in each of these files:

• cmd/kube-apiserver/OWNERS [liggitt]

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