MAINTAINERS: Cover system/arm/aspeed.rst with ASPEED BMC machines

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20201120154545.2504625-3-f4bug@amsat.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index a9c74f9..02f8b6f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1000,6 +1000,7 @@
 F: include/hw/misc/pca9552*.h
 F: hw/net/ftgmac100.c
 F: include/hw/net/ftgmac100.h
+F: docs/system/arm/aspeed.rst
 
 NRF51
 M: Joel Stanley <joel@jms.id.au>