📖 Update using_an_external_type.md

[davidxia]

fix typo in go import path

[k8s-ci-robot]

Hi @davidxia. Thanks for your PR.

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[camilamacedo86]

/lgtm
/approved

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, davidxia

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[camilamacedo86]

/ok-to-test