Update configmap.md

[sergeylanzman]

What this PR does / why we need it:

Fix typo in docs

Types of changes

Fix typo in docs

[k8s-ci-robot]

Hi @sergeylanzman. 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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[tao12345666333]

/lgtm
/kind documentation
/trigger accept

[tao12345666333]

/triage accepted

[rikatz]

/approve
Thanks

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rikatz, sergeylanzman, tao12345666333

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