scsi: advansys: Fix spelling of 'is'

s/isi/is/

Link: https://lore.kernel.org/r/20210326030412.1656-1-qiumibaozi_1@163.com
Signed-off-by: ganjisheng <ganjisheng@yulong.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/advansys.c

@@ -1812,7 +1812,7 @@ typedef struct adv_req {
  * Field naming convention:
  *
  *  *_able indicates both whether a feature should be enabled or disabled
- *  and whether a device isi capable of the feature. At initialization
+ *  and whether a device is capable of the feature. At initialization
  *  this field may be set, but later if a device is found to be incapable
  *  of the feature, the field is cleared.
  */