clarify pixel_format vs JxlBasicInfo in the encode API (#873)
clarify pixel_format vs JxlBasicInfo in the encode API (#873)


libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl