can: slcan: update dead link

BerliOS has not been operating for more than five years. linux-can moved to
GitHub.

Signed-off-by: Diego Elio Pettenò <flameeyes@flameeyes.com>
Link: https://lore.kernel.org/r/20200413170241.13207-1-flameeyes@flameeyes.com
[mkl: split into two patches - handle slcan part here]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/Kconfig

@@ -41,8 +41,8 @@ config CAN_SLCAN
 	  www.canusb.com / www.can232.com / www.mictronics.de / www.canhack.de
 
 	  Userspace tools to attach the SLCAN line discipline (slcan_attach,
-	  slcand) can be found in the can-utils at the SocketCAN SVN, see
-	  http://developer.berlios.de/projects/socketcan for details.
+	  slcand) can be found in the can-utils at the linux-can project, see
+	  https://github.com/linux-can/can-utils for details.
 
 	  The slcan driver supports up to 10 CAN netdevices by default which
 	  can be changed by the 'maxdev=xx' module option. This driver can