AStar3D docs state that get_point_path cannot be used from other threads which is apparently not true

[martyglaubitz]

Your Godot version:
4.4

Issue description:
The docs explicitly state that the Method get_point_path of the class AStar3D cannot be used from Threads:

Note: This method is not thread-safe. If called from a Thread, it will return an empty array and will print an error message.

Yet when using mutexes, to ensure the AStar3D object only ever gets used by one thread, it works fine.

URL to the documentation page:
https://docs.godotengine.org/en/stable/classes/class_astar3d.html#class-astar3d-method-get-point-path

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