🐛 fix grammar in scaffolded makefiles

[typeid]

Fixes #3540

This PR fixes some grammar errors in the scaffolded makefiles.

[k8s-ci-robot]

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[camilamacedo86]

/lgtm

/ok-to-test

Thank you for the contribution 🥇

[camilamacedo86]

See that is falling in the testdata check.
When we do a change we need to run make generate

So that we properly update the docs and samples with the change made in the template.

Could you please:
-a) rebase with the master
-b) run make generate
-c) ensure that you squash the commits

So that we can move forward within this one?

[typeid]

@camilamacedo86 should be good now :)

[camilamacedo86]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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