Bart Van Assche 3649ff0a0b block: Document the role of the two attribute groups
It is nontrivial to derive the role of the two attribute groups in source
file block/blk-sysfs.c. Hence add a comment that explains their roles. See
also commit 6d85ebf95c44 ("blk-sysfs: add a new attr_group for blk_mq").

Cc: Christoph Hellwig <hch@lst.de>
Cc: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20231128194019.72762-1-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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