Array: method remove_at() can take negative values

**Your Godot version:**
4.5.1.stable

**Issue description:**
The documentation for ``array.remove_at(position)`` says in the final paragraph that ``position`` cannot take negative values. But, it can. It even says so in the first paragraph.

**URL to the documentation page:**
https://docs.godotengine.org/en/stable/classes/class_array.html#class-array-method-remove-at
