MAINTAINERS: Adjust migration documentation files

Commit 8cb2f8b172 ("docs/migration: Create migration/ directory")
changed migration documentation file structure but forgot to update the
entries in the MAINTAINERS file.

Commit 4c6f8a79ae ("docs/migration: Split 'dirty limit'") extracted
dirty limit documentation to a new file without updating dirty limit
section in MAINTAINERS file.

Fix the above.

Fixes: 8cb2f8b172 ("docs/migration: Create migration/ directory")
Fixes: 4c6f8a79ae ("docs/migration: Split 'dirty limit'")
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Link: https://lore.kernel.org/r/20240407081125.13951-1-avihaih@nvidia.com
Signed-off-by: Peter Xu <peterx@redhat.com>

MAINTAINERS

@@ -2170,7 +2170,7 @@ S: Supported
 F: hw/vfio/*
 F: include/hw/vfio/
 F: docs/igd-assign.txt
-F: docs/devel/vfio-migration.rst
+F: docs/devel/migration/vfio.rst
 
 vfio-ccw
 M: Eric Farman <farman@linux.ibm.com>
@@ -2231,6 +2231,7 @@ F: qapi/virtio.json
 F: net/vhost-user.c
 F: include/hw/virtio/
 F: docs/devel/virtio*
+F: docs/devel/migration/virtio.rst
 
 virtio-balloon
 M: Michael S. Tsirkin <mst@redhat.com>
@@ -3422,7 +3423,7 @@ F: migration/
 F: scripts/vmstate-static-checker.py
 F: tests/vmstate-static-checker-data/
 F: tests/qtest/migration-test.c
-F: docs/devel/migration.rst
+F: docs/devel/migration/
 F: qapi/migration.json
 F: tests/migration/
 F: util/userfaultfd.c
@@ -3442,6 +3443,7 @@ F: include/sysemu/dirtylimit.h
 F: migration/dirtyrate.c
 F: migration/dirtyrate.h
 F: include/sysemu/dirtyrate.h
+F: docs/devel/migration/dirty-limit.rst
 
 Detached LUKS header
 M: Hyman Huang <yong.huang@smartx.com>