MAINTAINERS: update the SELinux entry

Bring the SELinux entry up to date with the following changes:

* Remove the selinuxproject.org link.  The wiki located there is in
read-only mode and exists primarily for historical reasons.

* Add our patchwork link.  I'm not sure this is of much use for
anyone but the maintainer, but there is a provision for including it
here so we might as well include it.

* Add a bug report URI.  I suspect most everyone knows to send mail
to the mailing list if they hit a bug, but let's make it official.

* Add a link to the SELinux tree process/management documentation.
While the doc exists both in the canonical kernel.org location and
the GitHub mirror, provide a link to the mirror as GitHub does a
better job rendering the Markdown.

* Update the source tree's git URI to use https.
Signed-off-by: Paul Moore <paul@paul-moore.com>

MAINTAINERS

@@ -19520,9 +19520,11 @@ M:	Stephen Smalley <stephen.smalley.work@gmail.com>
 M:	Eric Paris <eparis@parisplace.org>
 L:	selinux@vger.kernel.org
 S:	Supported
-W:	https://selinuxproject.org
 W:	https://github.com/SELinuxProject
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux.git
+Q:	https://patchwork.kernel.org/project/selinux/list
+B:	mailto:selinux@vger.kernel.org
+P:	https://github.com/SELinuxProject/selinux-kernel/blob/main/README.md
+T:	git https://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux.git
 F:	Documentation/ABI/removed/sysfs-selinux-checkreqprot
 F:	Documentation/ABI/removed/sysfs-selinux-disable
 F:	Documentation/admin-guide/LSM/SELinux.rst