block: Fix some kernel-doc comments

Remove the description of @required_features in elevator_match()
to clear the below warning:

block/elevator.c:103: warning: Excess function parameter 'required_features' description in 'elevator_match'

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2734
Fixes: ffb86425 ("block: don't check for required features in elevator_match")
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Link: https://lore.kernel.org/r/20221107062255.2685-1-yang.lee@linux.alibaba.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/elevator.c

@@ -94,7 +94,6 @@ static inline bool elv_support_features(struct request_queue *q,
  * elevator_match - Test an elevator name and features
  * @e: Scheduler to test
  * @name: Elevator name to test
- * @required_features: Features that the elevator must provide
  *
  * Return true if the elevator @e name matches @name and if @e provides all
  * the features specified by @required_features.