[css-color-4] "color adjuster" vs color-adjust

https://drafts.csswg.org/css-color-4/#modifying-colors defines a
spec concept called a "color adjuster"

https://drafts.csswg.org/css-color-4/#color-adjust defines a
property called 'color-adjust'.

These are basically unrelated things (beyond both being related to
colors).

One of these should be renamed; the names are currently too
confusing.  I think it's far more straightforward to rename the spec
concept.

-David

-- 
𝄞   L. David Baron                         http://dbaron.org/   𝄂
𝄢   Mozilla                          https://www.mozilla.org/   𝄂
             Before I built a wall I'd ask to know
             What I was walling in or walling out,
             And to whom I was like to give offense.
               - Robert Frost, Mending Wall (1914)