The definition of get_normal() method (KinematicCollision2D + 3D) makes no sense

**Your Godot version:** 4.2

**Issue description:** The definition of the `get_normal()` method for Kinematic Collision2D+3D currently is:

> Returns the colliding body's shape's normal at the point of collision.

1. What's a "normal?" Is it a normalised vector? With what direction? It's not clear.
2. Can you please rephrase "body's shape's" so the meaning is clear?

**URL to the documentation page (if already existing):** [Method Descriptions for KinematicCollision3D](https://docs.godotengine.org/en/stable/classes/class_kinematiccollision3d.html#method-descriptions) and [KinematicCollisions2D](https://docs.godotengine.org/en/stable/classes/class_kinematiccollision2d.html#method-descriptions)