[css-anchor-position-1] have a better example of using math functions with the anchor() function

The example in the draft showing how to use the anchor function with math functions involves verbose and complex calculations to center an element over its anchor: https://drafts.csswg.org/css-anchor-position-1/#example-a7ac0832

.centered-message {
  position: fixed;
  max-width: max-content;
  justify-self: center;

  --center: anchor(--x 50%);
  --half-distance: min(
    abs(0% - var(--center)),
    abs(100% - var(--center))
  );
  left: calc(var(--center) - var(--half-distance));
  right: calc(var(--center) - var(--half-distance));
  bottom: anchor(--x top);
}

This was noted months ago at #8979 and the anchor-center value was added as an easy way to achieve a similar behavior. However, the example remains the same at the specs and there isn't another example of using math functions with anchor() in a useful way.

So I think it would be better to:

remove the current example from the spec and,
add a new example showing off anchor() with math functions

Some examples could be using calc() to position an element a little inside its anchor top corner, like a notification:

https://codepen.io/monknow/pen/gONevrr

.target {
  --target-height: 30px;
  --target-width: 20px;
 
  position: absolute;
  position-anchor: --my-anchor;

  left: calc(anchor(right) - var(--target-width) / 2);
  bottom: calc(anchor(top) - var(--target-height) / 2);
  
  height: var(--target-height);
  width: var(--target-width)
}

Or this one by Jhey Tompkins that uses max() to attach a tooltip to the tallest element and min() to the smallest.

https://codepen.io/web-dot-dev/pen/PoeNKXJ

.chart__tooltip--max {
    position: absolute;
    left: anchor(--chart right);
    bottom: max(
      anchor(--anchor-1 top),
      anchor(--anchor-2 top),
      anchor(--anchor-3 top)
    );
}

.chart__tooltip--min {
    position: absolute;
    right: calc(anchor(--chart left) + 1rem);
    bottom: min(
      anchor(--anchor-1 top),
      anchor(--anchor-2 top),
      anchor(--anchor-3 top)
    );
}