Roll documentation linting tool versions forward

What does this merge request do and why?

For gitlab-org/technical-writing/docs-gitlab-com#532 (closed), let's roll documentation linting tool versions forward.

I've fixed any violations found by updated tooling.

We'll disable the new MD060 rule until https://github.com/DavidAnson/markdownlint/issues/1818 is resolved.

Impacted categories

The following categories relate to this merge request:

Merge request checklist

  • This MR references an issue describing the change.
  • This change is backward compatible. If not, include steps to communicate to users.
  • Tests added for new functionality. If not, raise an issue to follow-up.
  • Observability added/updated (logging, metrics, tracing).
  • Documentation added/updated.
  • Announcement added for notable changes.
  • gdk doctor test added.

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