MAINTAINERS: add missing entries for throttling infra

Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NAlberto Garcia <berto@igalia.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

MAINTAINERS

@@ -1595,8 +1595,10 @@ M: Alberto Garcia <berto@igalia.com>
 S: Supported
 F: block/throttle-groups.c
 F: include/block/throttle-groups.h
-F: include/qemu/throttle.h
+F: include/qemu/throttle*.h
 F: util/throttle.c
+F: docs/throttle.txt
+F: tests/test-throttle.c
 L: qemu-block@nongnu.org
 
 UUID