update terminology per https://www.w3.org/WAI/EO/wiki/Style#colorblind#2143

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shawna-slh wants to merge 1 commit intomainfrom colorblind-update

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Commits on Nov 29, 2021

update terminology per https://www.w3.org/WAI/EO/wiki/Style#colorblind
shawna-slh
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