"2D lights and shadows" page should have a section about light limits

**Your Godot version:**
4.5.stable

**Issue description:**

[Under the 3D part of the manual it talks about the limitations of lights](https://docs.godotengine.org/en/stable/tutorials/3d/lights_and_shadows.html#light-number-limits).

However these limitations are not mentioned under the 2D part of the manual. This feels like an oversight as presumably these (or some) limitations also apply to lights in a 2D scene?

**URL to the documentation page (if already existing):**
https://docs.godotengine.org/en/stable/tutorials/2d/2d_lights_and_shadows.html

**Further context**
This came to my attention by a topic that was raised on the Godot Forums [I think I found a Godot bug](https://forum.godotengine.org/t/i-think-i-found-a-godot-bug/125307). I knew I'd read about light limitations, which made sense as I'm working on a 3D game.