🐛 fix a minor typo in Makefile

[ebiiim]

Description
Fixed a minor typo in the Makefile template.

Motivation
This is a minor issue, but many users will see the Makefile.

Sorry to bother you to check!

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: ebiiim / name: Shunsuke Ise (2ea935f)

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[k8s-ci-robot]

Hi @ebiiim. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[camilamacedo86]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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