Vector2.reflect() and Vector2.bounce() are unclear

**Your Godot version:**
4.3
**Issue description:**
This issue originates from a question in the official discord. Making this issue to track it.

These should probably be clarified somehow, maybe with example vectors. Ideally illustrations could be added, but that is not typical of the docs.

Same issue might apply to Vector3.

A possible solution would be adding some info and a diagram about the difference between reflect and bounce [here](https://docs.godotengine.org/en/stable/tutorials/math/vector_math.html#reflection), then linking to it from the class ref pages if that's allowed.

**URL to the documentation page (if already existing):**
https://docs.godotengine.org/en/stable/classes/class_vector2.html#class-vector2-method-bounce
https://docs.godotengine.org/en/stable/classes/class_vector2.html#class-vector2-method-reflect
https://docs.godotengine.org/en/stable/tutorials/math/vector_math.html#reflection