MAINTAINERS: sctp: move Neil to CREDITS

Neil moved away from SCTP related duties.
Move him to CREDITS then and while at it, update SCTP
project website.

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

CREDITS

@@ -1706,6 +1706,10 @@ S: Panoramastrasse 18
 S: D-69126 Heidelberg
 S: Germany
 
+N: Neil Horman
+M: nhorman@tuxdriver.com
+D: SCTP protocol maintainer.
+
 N: Simon Horman
 M: horms@verge.net.au
 D: Renesas ARM/ARM64 SoC maintainer

MAINTAINERS

@@ -18842,12 +18842,11 @@ F:	drivers/target/
 F:	include/target/
 
 SCTP PROTOCOL
-M:	Neil Horman <nhorman@tuxdriver.com>
 M:	Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
 M:	Xin Long <lucien.xin@gmail.com>
 L:	linux-sctp@vger.kernel.org
 S:	Maintained
-W:	http://lksctp.sourceforge.net
+W:	https://github.com/sctp/lksctp-tools/wiki
 F:	Documentation/networking/sctp.rst
 F:	include/linux/sctp.h
 F:	include/net/sctp/