```
ExplainSwitch to umount -aA in rc.d/rootoot and document it
Our root serivce, which is primarly used to mount the root partition rw isread-write,
is executing `umount -a` at some point. It is somewhat confusing to see a commandthe users
to unmount all paritions in a service,to see it in a service, which is supposed to mount the partitions. which is supposed to mount the mostLet's document
important partition.
Perhaps `umount -a` could be replaced with `umount -A` at some pointthe reasoning behind having umount in this service at all. Also, replace `umount -a`
with `umount -A` as we do not intend to umount root anyway.
```