A pro will usually just remove the board & replace.
Another option is a melt stick, Kind of a high strength wax that is blended together to match your floor & melted in place & the smoothed. Again a professional skill.
If you want a home remedy, crayons or a bit of Minwax stain can be used to darken the scratch, then a clear fingernail polish with a matching gloss level can be applied to seal the color in.
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