MAINTAINERS: Update dlm maintainer and web page

Signed-off-by: David Teigland <teigland@redhat.com>

MAINTAINERS

@@ -6114,11 +6114,11 @@ F:	drivers/video/fbdev/udlfb.c
 F:	include/video/udlfb.h
 
 DISTRIBUTED LOCK MANAGER (DLM)
-M:	Christine Caulfield <ccaulfie@redhat.com>
+M:	Alexander Aring <aahringo@redhat.com>
 M:	David Teigland <teigland@redhat.com>
 L:	gfs2@lists.linux.dev
 S:	Supported
-W:	http://sources.redhat.com/cluster/
+W:	https://pagure.io/dlm
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm.git
 F:	fs/dlm/