fix: include kubeadm verbosity flag in generated docs

[aryansk]

Summary

• initialize kubeadm\u0027s supported klog flags before generating reference docs
• include -v, --v in generated kubeadm docs while keeping unsupported logging flags hidden

This addresses kubernetes/website#48717.

Validation

• go test ./...
• go run main.go build kubeadm
• verified build/kubeadm.md contains -v, --v int

Codex was used to inspect the issue and repository, implement this focused fix, and run the available validation. I reviewed the final diff and generated output.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: aryansk / name: Aryan Singh K. (646813e)

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[neolit123]

/lgtm

$ kubeadm --help

...
 
 -v, --v Level              number for the log level verbosity
      --vmodule moduleSpec   comma-separated list of pattern=N settings for file-filtered logging

[Caesarsage]

you need sign the cla @aryansk so reviewers can review/approve this change

[Caesarsage]

/easycla

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: aryansk, lavishpal
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[aryansk]

Thanks @lavishpal for the approval and thoughtful review! Really appreciate you taking the time to look this over.