scsi: target: Remove the references to http://www.linux-iscsi.org/

scsi: target: Remove the references to linux-iscsi.org/

The website http://www.linux-iscsi.org/ disappeared more than a year ago.
DNS records have been removed for linux-iscsi.org. The company that
sponsored this website (Datera; formerly called Rising Tide) has been
liquidated in early 2021 according to
https://blocksandfiles.com/2021/03/19/datera-is-being-liquidated/.  Since
it is unlikely that the website http://www.linux-iscsi.org/ will be
restored, remove the references to that website.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230920200232.3721784-2-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>