Add missing `css` to syntax list on Node API doc (#4409)
Add missing `css` to syntax list on Node API doc (#4409)

See <https://github.com/stylelint/stylelint/blob/334f615149fe7b35aaf8b884097bbaf7d92837ad/lib/getPostcssResult.js#L95>.
stylelint/stylelint,stylelint/stylelint,stylelint/stylelint,stylelint/stylelint