Explore more controversial "use"s for types

[Vrixyz]

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This pull request:

Existing (https://docs.rs/parry3d/0.16.1/parry3d/math/type.Point.html):

(note there is no scroll there, there is way less information.)

I'm not a huge fan of the big disclaimer "Because this is an alias, not all its methods are listed here. See the Point type too." 💭

❓ I'm surprised Vector shows as Vector rather than Vector2 (or Vector3).

• and that the alias points to na::Matrix rather than na::Vector.

• given this :

pub use Vector2 as Vector;

• I'm surprised that it doesn't render as Vector2 ; where Real correctly render as f32
  
• and directs to
•