man/kernel-command-line: don't refer early_core_pattern to systemd

It is defined later in the same file

(cherry picked from commit d511acd)
(cherry picked from commit b283661)

Author: abderrahim

man/kernel-command-line.xml

@@ -54,7 +54,6 @@
         <term><varname>systemd.unit=</varname></term>
         <term><varname>rd.systemd.unit=</varname></term>
         <term><varname>systemd.dump_core</varname></term>
-        <term><varname>systemd.early_core_pattern=</varname></term>
         <term><varname>systemd.crash_chvt</varname></term>
         <term><varname>systemd.crash_shell</varname></term>
         <term><varname>systemd.crash_reboot</varname></term>