Fix typo on .markdown-lint.yml

[riuri]

Proposed Changes

1. Typo: “far to short” ⇒ “far too short”.
2. This change is a trivial comment change.

Readiness Checklist

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• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[zkoppert]

Thanks for taking the time to fix this @riuri !