Say from_axes, which is what a constructor is called

`per_axis` on `PlaceDesc` and `Declared` builds a pair by asking for each
axis. `from_axis` beside it already names the three-argument form, so the
plural is the one that takes a function, and both follow Rust's convention
for a constructor rather than an invented word.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/widget/position/stack.rs

@@ -31,7 +31,7 @@ impl Widget for Stack {
         // fraction under them is a fraction of it. A share leaves the axis
         // to whoever gave the stack its box. Where a child sits in a box
         // bigger than itself is its own business.
-        let place = PlaceDesc::per_axis(|axis| {
+        let place = PlaceDesc::from_axes(|axis| {
             let len = size[axis];
             match len.leftover == Weight::ZERO {
                 true => len.without_leftover().as_desc().fills(),