Render Priority Documentation has example values reversed of how it actually behaves

[michaelharmonart]

Your Godot version:
4.4 Beta

Issue description:

In actuallity, setting a render priority of -1 will be rendered before all objects of priority 0. This gave me a headache when I first started messing with these values and they weren't behaving properly. (see: godotengine/godot#98344 )

URL to the documentation page:

https://docs.godotengine.org/en/latest/classes/class_material.html#class-material-property-render-priority