docs: correct BlasAabbGeometry stride reference and document AABB layout (#9934)

Author: mstampfli

CHANGELOG.md

@@ -101,6 +101,12 @@ Bottom level categories:
 
 - Fixed signed integer `%` (and `%=`) returning the wrong result for negative operands in the GLSL (OpenGL/GLES) backend, e.g. `-1 % 768` yielding `255` instead of `-1`. GLSL's `%` is undefined when either operand is negative, so signed remainder is now lowered as `a - b * (a / b)`, matching the SPIR-V, HLSL, and Metal backends. By @mstampfli in [#9687](https://github.com/gfx-rs/wgpu/pull/9687).
 
+### Documentation
+
+#### General
+
+- Fix the `BlasAabbGeometry` docs to refer to the `stride` field instead of a nonexistent `size.stride`, and document the packed AABB buffer layout (each primitive a minimum then a maximum corner, two consecutive `vec3<f32>`). By @mstampfli in [#9934](https://github.com/gfx-rs/wgpu/pull/9934).
+
 ### Dependency Updates
 
 #### General

wgpu/src/api/blas.rs

@@ -132,16 +132,18 @@ static_assertions::assert_impl_all!(BlasTriangleGeometry<'_>: WasmNotSendSync);
 
 /// Definition for an axis-aligned bounding box geometry group for a bottom level acceleration structure.
 ///
-/// Buffer data must contain `size.primitive_count` primitives at `primitive_offset`, each `size.stride` bytes,
-/// with `stride` at least [`AABB_GEOMETRY_MIN_STRIDE`] and a multiple of 8.
+/// Buffer data must contain `size.primitive_count` primitives at `primitive_offset`, each `stride` bytes
+/// apart, with `stride` at least [`AABB_GEOMETRY_MIN_STRIDE`] and a multiple of 8.
 #[derive(Debug)]
 pub struct BlasAabbGeometry<'a> {
     /// Sub descriptor for the size defining attributes of this geometry.
     pub size: &'a BlasAABBGeometrySizeDescriptor,
     /// Stride in bytes between consecutive AABB primitives in the buffer (at least
     /// [`AABB_GEOMETRY_MIN_STRIDE`], and must be a multiple of 8).
     pub stride: wgt::BufferAddress,
-    /// Buffer containing packed AABB primitives (layout determined by `size.stride`).
+    /// Buffer containing packed AABB primitives. Each primitive is a minimum corner
+    /// then a maximum corner, two consecutive `vec3<f32>` (24 bytes, the
+    /// [`AABB_GEOMETRY_MIN_STRIDE`]); consecutive primitives are `stride` bytes apart.
     pub aabb_buffer: &'a Buffer,
     /// Byte offset to the first AABB primitive (must be a multiple of 8).
     pub primitive_offset: u32,