MAINTAINERS: Include documentation in KVM/arm64 entry

Ensure updates to the KVM/arm64 documentation get sent to the right
place.

Acked-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20240628222147.3153682-1-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

Author: oupton

MAINTAINERS

@@ -12078,6 +12078,8 @@ L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 L:	kvmarm@lists.linux.dev
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git
+F:	Documentation/virt/kvm/arm/
+F:	Documentation/virt/kvm/devices/arm*
 F:	arch/arm64/include/asm/kvm*
 F:	arch/arm64/include/uapi/asm/kvm*
 F:	arch/arm64/kvm/