mtd: ubi: wl: Fix a couple of kernel-doc issues

mainline inclusion
from mainline-v5.11-rc1
commit ab4e4de9
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6K5OH
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ab4e4de9fd8b469823a645f05f2c142e9270b012

--------------------------------

Fixes the following W=1 kernel build warning(s):

 drivers/mtd/ubi/wl.c:584: warning: Function parameter or member 'nested' not described in 'schedule_erase'
 drivers/mtd/ubi/wl.c:1075: warning: Excess function parameter 'shutdown' description in '__erase_worker'

Cc: Richard Weinberger <richard@nod.at>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: linux-mtd@lists.infradead.org
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NMiquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20201109182206.3037326-13-lee.jones@linaro.orgSigned-off-by: NZhaoLong Wang <wangzhaolong1@huawei.com>
Reviewed-by: NHou Tao <houtao1@huawei.com>

drivers/mtd/ubi/wl.c

@@ -575,6 +575,7 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
  * @vol_id: the volume ID that last used this PEB
  * @lnum: the last used logical eraseblock number for the PEB
  * @torture: if the physical eraseblock has to be tortured
+ * @nested: denotes whether the work_sem is already held in read mode
  *
  * This function returns zero in case of success and a %-ENOMEM in case of
  * failure.
@@ -1066,8 +1067,6 @@ static int ensure_wear_leveling(struct ubi_device *ubi, int nested)
  * __erase_worker - physical eraseblock erase worker function.
  * @ubi: UBI device description object
  * @wl_wrk: the work object
- * @shutdown: non-zero if the worker has to free memory and exit
- * because the WL sub-system is shutting down
  *
  * This function erases a physical eraseblock and perform torture testing if
  * needed. It also takes care about marking the physical eraseblock bad if