📖 Fix a minor typo in API document

[fenggw-fnst]

No description provided.

[metal3-io-bot]

Hi @fenggw-fnst. Thanks for your PR.

I'm waiting for a metal3-io 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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[tuminoid]

/ok-to-test

[honza]

/approve

[metal3-io-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: honza

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[zhouhao3]

/test-centos-integration-main
/test-ubuntu-integration-main
/lgtm

[tuminoid]

/test markdownlint

[kashifest]

/hold

[kashifest]

/hold cancel