vfio/type1: fix a couple of spelling mistakes

There are several spelling mistakes, as follows:
userpsace ==> userspace
Accouting ==> Accounting
exlude ==> exclude

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <20210326083528.1329-2-thunder.leizhen@huawei.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>