doc: Try to clarify automount dependency confusion

Arch recently upgraded systemd to 245.6. Shortly afterwards, users began
reporting[0] that systemd detected an ordering cycle, and they were
unable to log in. The reason they were unable to log in was because of
ordering cycle resolution:

    [...]
    systemd[1]: sysinit.target: Job systemd-tmpfiles-setup.service/start deleted to break ordering cycle starting with sysinit.target/start
    systemd[1]: sysinit.target: Job systemd-update-done.service/start deleted to break ordering cycle starting with sysinit.target/start
    systemd[1]: sysinit.target: Job systemd-journal-catalog-update.service/start deleted to break ordering cycle starting with sysinit.target/start
    systemd[1]: sysinit.target: Job local-fs.target/start deleted to break ordering cycle starting with sysinit.target/start
    systemd[1]: sysinit.target: Job systemd-tmpfiles-setup.service/start deleted to break ordering cycle starting with sysinit.target/start
    [...]

Whether the resolution did the right thing here or not is a longer-term
discussion, but in the interim we should at least make this distinction
between automount dependencies and mount dependencies clearer in the
documentation, so that users and distribution maintainers know what's
acceptable. In this case Arch actually backed out b3d7aef5 entirely and
released a new version due to the confusion.

Also see https://github.com/systemd/systemd-stable/issues/69.

0: https://bugs.archlinux.org/task/66908