Document `Object.get_class()/is_class()` ignores `class_name` declaration
Document `Object.get_class()/is_class()` ignores `class_name` declaration

(cherry picked from commit a15847e5cae47a40113e504fc7914eb84a6f1171)

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot