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: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20201109182206.3037326-13-lee.jones@linaro.org


Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com>
Reviewed-by: Hou Tao <houtao1@huawei.com>