add note to DimStyle.load_dxf_attribs()
add note to DimStyle.load_dxf_attribs()

group code 70 is used 2x, simple_dxfattribs_loader()
can't be used!

mozman/ezdxf,mozman/ezdxf,mozman/ezdxf,mozman/ezdxf,mozman/ezdxf