Explicitly state coordinate space in Aabb docs

In the docs for the Aabb component:
https://docs.rs/bevy/latest/bevy/render/primitives/struct.Aabb.html

it's not entirely clear what coordinate space inputs for the functions should be in.

Adding a line to clarify this such as:
> center and half_extents are stored in local space.

and updating function descriptions and comments, for example:

> `pub fn from_min_max(minimum: Vec3, maximum: Vec3) -> Aabb`
> min and max are in local space.

would help clear up the confusion.

Start from the Aabb API documentation at docs.rs and locate the descriptions for center, half_extents, and from_min_max. Clarify that the values use local space, including the function descriptions and comments; done when the coordinate space is explicit throughout the Aabb documentation.

Written by the indexing model from the issue text.