Amend "contrast ratio" term #4400
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The term now (with 1.4.11) applies to both text and non-text content, but it seems incorrect to refer to specific testing methodology in the normative term rather than in the more specific SCs. 1.4.3 and 1.4.6 understanding (https://www.w3.org/WAI/WCAG22/Understanding/contrast-minimum.html and https://www.w3.org/WAI/WCAG22/Understanding/contrast-enhanced) already have a note about antialiasing, so it's redundant to have here)
The note about assuming a particular background is contentious at best. The note about "it is a failure" seems inappropriate in the normative term definition. A failure of what? This sort of note (if it were actually normatively intended) probably should go in the understanding document for a specific SC.
mentioning font smoothing here is irrelevant
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A different take compared to #1018
While reviewing that PR, it was noted that some of the existing notes in the term are inappropriate and incorrect.
This PR removes them altogether (which does mean this is a normative change), and moves one note to the understanding for contrast minimum and contrast enhanced.