Fix typo in populate_instancegroup_spec.go

[yurrriq]

APIServrNodes -> APIServerNodes

[k8s-ci-robot]

Hi @yurrriq. Thanks for your PR.

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[yurrriq]

/assign @olemarkus

[johngmyers]

Thanks!

[olemarkus]

Thanks for catching this

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johngmyers, olemarkus

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[olemarkus]

/ok-to-test