man: fix typo in unit options section

Fixes #32918

(cherry picked from commit f9572d2)
(cherry picked from commit bcda6d4)
(cherry picked from commit 21e0842)
(cherry picked from commit 90d9126)
(cherry picked from commit aaad626)

Author: hellozee

man/systemd.unit.xml

@@ -805,7 +805,7 @@
         type when precisely a unit has finished starting up. Most importantly, for service units start-up is
         considered completed for the purpose of <varname>Before=</varname>/<varname>After=</varname> when all
         its configured start-up commands have been invoked and they either failed or reported start-up
-        success. Note that this does includes <varname>ExecStartPost=</varname> (or
+        success. Note that this includes <varname>ExecStartPost=</varname> (or
         <varname>ExecStopPost=</varname> for the shutdown case).</para>
 
         <para>Note that those settings are independent of and orthogonal to the requirement dependencies as