Add missing _r_ for ctl-alt-del.target
<listitem><para>Upon receiving this signal the systemd system
manager will start the
<filename>ctrl-alt-del.target</filename> unit. This is mostly
- equivalent to <command>systemctl start ctl-alt-del.target
+ equivalent to <command>systemctl start ctrl-alt-del.target
--job-mode=replace-irreversible</command>. If this signal is
received more than 7 times per 2s, an immediate reboot is
triggered. Note that pressing Ctrl-Alt-Del on the console