scsi: advansys: Fix spelling of 'is'

s/isi/is/

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: ganjisheng <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/advansys.c

···
  * 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.
  */