MAINTAINERS: Adjust file list for PPC e500 machines

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

MAINTAINERS

@@ -1380,6 +1380,7 @@ e500
 L: qemu-ppc@nongnu.org
 S: Orphan
 F: hw/ppc/e500*
+F: hw/ppc/ppce500_spin.c
 F: hw/gpio/mpc8xxx.c
 F: hw/i2c/mpc_i2c.c
 F: hw/net/fsl_etsec/
@@ -1389,6 +1390,7 @@ F: include/hw/pci-host/ppce500.h
 F: pc-bios/u-boot.e500
 F: hw/intc/openpic_kvm.h
 F: include/hw/ppc/openpic_kvm.h
+F: docs/system/ppc/ppce500.rst
 
 mpc8544ds
 L: qemu-ppc@nongnu.org