scsi: dc395x: Documentation: Reword original driver attribution

The Linux kernel isn't in 2.6.x anymore, but rather the major version
has advanced much (currently 6.x). Reword the attribution.

Also, replace 404'ed 2.4 driver link with web.archive.org snapshot [1].

Link: https://web.archive.org/web/20140129181343/http://www.garloff.de/kurt/linux/dc395/ [1]
Signed-off-by: Bagas Sanjaya <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Martin K. Petersen <[e-mail]>

Documentation/scsi/dc395x.rst

···
 great degree and caution should be exercised if you want to attempt
 to use this driver with hard disks.
 
-This is a 2.5 only driver. For a 2.4 driver please see the original
-driver (which this driver started from) at
-http://www.garloff.de/kurt/linux/dc395/
-
+This driver is evolved from `the original 2.4 driver
+<https://web.archive.org/web/20140129181343/http://www.garloff.de/kurt/linux/dc395/>`_.
 Problems, questions and patches should be submitted to the `Linux SCSI
 mailing list <[e-mail]>`_.