[css-ui-4][editorial] Let outline-color refer to border-top-color values
#12993
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The description of
outline-colorrefers to<'border-color'>while its syntax definition explicitly contains<color> | <image-1D>.This has two issues:
border-coloris a shorthand that takes one to four values, which is not what was intended foroutline-colorSo this PR changes them to both refer to
<'border-top-color'>, which only takes one value and is also referenced in other related places.Sebastian