media: staging: rkisp1: remove TODO item to document quantization handling

The quantization handling is already documented
in the file rkisp1.rst so this item can be removed.

Fixes: 66167269 (media: staging: rkisp1: allow quantization setting by userspace on the isp source pad)
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/rkisp1/TODO

 * Fix pad format size for statistics and parameters entities.
 * Fix checkpatch errors.
-* Add uapi docs. Remember to add documentation of how quantization is handled.
 * streaming paths (mainpath and selfpath) check if the other path is streaming
 in several places of the code, review this, specially that it doesn't seem it
 supports streaming from both paths at the same time.