<listitem><para>Slice units may be used to
group units which manage system processes
(such as service and scope units) in a
- hierachial tree for resource management
+ hierarchical tree for resource management
purposes. See
<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para></listitem>
option prefixed with
<literal>rd.</literal> is honored
only in the initial RAM disk (initrd),
- while the one that isn't prefixed only
+ while the one that is not prefixed only
in the main system.</para></listitem>
</varlistentry>