block: fix kerneldoc comment for blk_attempt_plug_merge()
Jonathan Corbet authored
Commit 5f0ed774

 ("block: sum requests in the plug structure") removed
the request_count parameter from block_attempt_plug_merge(), but did not
remove the associated kerneldoc comment, introducing this warning to the
docs build:

  ./block/blk-core.c:685: warning: Excess function parameter 'request_count' description in 'blk_attempt_plug_merge'

Remove the obsolete description and make things a little quieter.
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
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