kn quickstart kind : A local registry is no longer created by default.

[yanggangtony]

Fixes #5778.

The latest code shows that

A local registry is no longer created by default.
To create a local registry, use the --registry flag.

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[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[knative-prow]

Welcome @yanggangtony! It looks like this is your first PR to knative/docs 🎉

[ReToCode]

/hold see #5778 (comment)

[github-actions]

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