[doc] Catch up the recent changes in kubernetes-template-project

[waltforme]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Looks like there are non-trivial updates in kubernetes-template-project after this repository was generated from there. So this PR aggregates those changes in PRs 41, 42, and 43, then introduces the aggregated changes here.

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

None

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

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[alculquicondor]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alculquicondor, waltforme

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• OWNERS [alculquicondor]

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: fb1198cf39218d0e0581b52e6c649219948b8b22