MAINTAINERS: repair a malformed T: entry in IDMAPPED MOUNTS

The T: entries shall be composed of a SCM tree type (git, hg, quilt, stgit
or topgit) and location.

Add the SCM tree type to the T: entry and reorder the file entries in
alphabetical order.

Fixes: ddc84c9 ("MAINTAINERS: update idmapping tree")
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>

Author: bulwahn

MAINTAINERS

@@ -9871,10 +9871,10 @@ M:	Christian Brauner <brauner@kernel.org>
 M:	Seth Forshee <sforshee@kernel.org>
 L:	linux-fsdevel@vger.kernel.org
 S:	Maintained
-T:	git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping.git
 F:	Documentation/filesystems/idmappings.rst
-F:	tools/testing/selftests/mount_setattr/
 F:	include/linux/mnt_idmapping.*
+F:	tools/testing/selftests/mount_setattr/
 
 IDT VersaClock 5 CLOCK DRIVER
 M:	Luca Ceresoli <luca@lucaceresoli.net>