set_input_as_handled doesn't exist in 4.0/latest

[FyiurAmron]

Your Godot version: 4.0 beta-1

Issue description: Official docs for 4.0/latest mention SceneTree.set_input_as_handled() in input HowTo tutorials, but it doesn't exist anymore. Also, there's no mention of a method to mark input events as handled that would be supported in 4.0 there.

URL to the documentation page: https://docs.godotengine.org/en/latest/tutorials/inputs/inputevent.html#how-does-it-work

• it points to

https://docs.godotengine.org/en/latest/classes/class_scenetree.html#class-scenetree-method-set-input-as-handled

which doesn't exist anymore. (verified it in the editor, the method is no more)

(https://docs.godotengine.org/en/stable/classes/class_scenetree.html#class-scenetree-method-set-input-as-handled does exist and works, though)