Add a helper script for reformatting Markdown files

[pymander]

This helper script can be a great first step to reformat and fix Markdown files to get them closer to the K8s style guidelines.

Which issue(s) this PR fixes:

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[mrbobbytables]

/unassign @spiffxp @tpepper /assign @cblecker @nikhita

I think this is fine as is as a formatting helper, its not exact but does apply much of the style guide. What are your thoughts?

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/lifecycle stale

[markjacksonfishing]

/remove-lifecycle stale

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/lifecycle stale

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/lifecycle rotten

[spiffxp]

/uncc

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closed this PR.

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/close

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