MAINTAINERS: Cover docs/igd-assign.txt in VFIO section

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210202155611.998424-1-philmd@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index b6ab3d2..5b74df5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1809,6 +1809,7 @@
 S: Supported
 F: hw/vfio/*
 F: include/hw/vfio/
+F: docs/igd-assign.txt
 
 vfio-ccw
 M: Cornelia Huck <cohuck@redhat.com>