scsi: core: Add comment to target_destroy in scsi_host_template

Add comment to indicate that the callback function target_destroy in the
scsi_host_template must not sleep.

Signed-off-by: Wenchao Hao <haowenchao2@huawei.com>
Link: https://lore.kernel.org/r/20231018113746.1940197-3-haowenchao2@huawei.com


Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>