block: fix warning on 'make htmldocs'

block: fix warning on 'make htmldocs'

Fix the following warning when running 'make htmldocs':

+WARNING: include/linux/blk-mq.h:532 struct member 'update_nr_hwq_lock' not described in 'blk_mq_tag_set'

Fixes: 98e68f67020c ("block: prevent adding/deleting disk during updating nr_hw_queues")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/all/20250507163220.00141d77@canb.auug.org.au/
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20250507092537.3009112-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>