null_blk: add an usage for shared tags in documentation
Add usage explanation for a shared_tags, introduced by commit: 82f402fe ("null_blk: add support for shared tags") Signed-off-by: NMinwoo Im <minwoo.im.dev@gmail.com> Reworded slightly. Signed-off-by: NJens Axboe <axboe@kernel.dk>
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