MAINTAINERS: Add docs/migration.txt to the "Migration" section

Signed-off-by: NThomas Huth <thuth@redhat.com>
Reviewed-by: NAmit Shah <amit.shah@redhat.com>
Message-Id: <1456393669-20678-1-git-send-email-thuth@redhat.com>
Signed-off-by: NAmit Shah <amit.shah@redhat.com>

MAINTAINERS

@@ -1241,6 +1241,7 @@ F: include/migration/
 F: migration/
 F: scripts/vmstate-static-checker.py
 F: tests/vmstate-static-checker-data/
+F: docs/migration.txt
 
 Seccomp
 M: Eduardo Otubo <eduardo.otubo@profitbricks.com>