doc: fix color contrast issue in light mode #56272
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Attributes are being highlighted as #f00 on a background of #f2f2f2 in light mode. That's a color contrast of 3.98:1, failing to meet the 4.5:1 requirement of WCAG 2.1 AA. This changes the attribute color to #d00, which has a color contrast of 5.09:1 meeting the 4.5:1 requirement.
By the way, I'm not sure if we document it anywhere, but it would probably be useful to document that we strive for WCAG 2.1 AA compliance (and not AAA compliance which might not even be possible, or some other WCAG version compliance).
Before:
After: