etcd: add markdown lint presubmit job

[joshjms]

Prow job for markdown linting.

For etcd-io/etcd#18059

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: joshjms / name: Joshua James (0264f95)

[k8s-ci-robot]

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @joshjms. Thanks for your PR.

I'm waiting for a kubernetes 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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