docs: scsi: target.rst: remove iSCSI transport class kernel-doc markup

This is already included at scsi.rst. So, remove the duplication,
in order to avoid Sphinx warnings.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/driver-api/target.rst

@@ -41,18 +41,6 @@ iSCSI boot information
 .. kernel-doc:: drivers/scsi/iscsi_boot_sysfs.c
    :export:
 
-
-iSCSI transport class
-=====================
-
-The file drivers/scsi/scsi_transport_iscsi.c defines transport
-attributes for the iSCSI class, which sends SCSI packets over TCP/IP
-connections.
-
-.. kernel-doc:: drivers/scsi/scsi_transport_iscsi.c
-   :export:
-
-
 iSCSI TCP interfaces
 ====================