Move bounding_2d example to math folder (#17523)

# Objective

The bounding_2d example was originally placed in 2d_rendering because
there was no folder for bounding or math, but now that this folder exist
it makes no sense for it to be here.

## Solution

Move the example

## Testing

I ran the example

Cargo.toml

@@ -778,13 +778,13 @@ wasm = true
 
 [[example]]
 name = "bounding_2d"
-path = "examples/2d/bounding_2d.rs"
+path = "examples/math/bounding_2d.rs"
 doc-scrape-examples = true
 
 [package.metadata.example.bounding_2d]
-name = "2D Bounding Volume Intersections"
+name = "Bounding Volume Intersections (2D)"
 description = "Showcases bounding volumes and intersection tests"
-category = "2D Rendering"
+category = "Math"
 wasm = true
 
 [[example]]

examples/README.md

@@ -103,7 +103,6 @@ Example | Description
 Example | Description
 --- | ---
 [2D Bloom](../examples/2d/bloom_2d.rs) | Illustrates bloom post-processing in 2d
-[2D Bounding Volume Intersections](../examples/2d/bounding_2d.rs) | Showcases bounding volumes and intersection tests
 [2D Rotation](../examples/2d/rotation.rs) | Demonstrates rotating entities in 2D with quaternions
 [2D Shapes](../examples/2d/2d_shapes.rs) | Renders simple 2D primitive shapes like circles and polygons
 [2D Viewport To World](../examples/2d/2d_viewport_to_world.rs) | Demonstrates how to use the `Camera::viewport_to_world_2d` method
@@ -372,6 +371,7 @@ Example | Description
 
 Example | Description
 --- | ---
+[Bounding Volume Intersections (2D)](../examples/math/bounding_2d.rs) | Showcases bounding volumes and intersection tests
 [Cubic Splines](../examples/math/cubic_splines.rs) | Exhibits different modes of constructing cubic curves using splines
 [Custom Primitives](../examples/math/custom_primitives.rs) | Demonstrates how to add custom primitives and useful traits for them.
 [Random Sampling](../examples/math/random_sampling.rs) | Demonstrates how to sample random points from mathematical primitives