Fix wrong return and argument types in documentation

scene/2d/canvas_item.cpp

scene/3d/spatial_stream_player.cpp

scene/gui/item_list.cpp

scene/gui/tree.cpp

scene/gui/video_player.cpp

scene/main/canvas_layer.cpp

scene/main/node.cpp

scene/resources/surface_tool.cpp

servers/physics_2d_server.cpp