The link pointed at a bare relative path (--check-filename) instead of
the in-page anchor for the ### --check-filename heading further down the
page, so it 404s on the rendered docs site. Point it at #check-filename
(Hugo strips leading dashes when generating header anchors).
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Co-authored-by: no-hup <19599684+no-hup@users.noreply.github.com>
