man/systemd.special: fix a typo

(cherry picked from commit 62ec479)

Author: stepnem

man/systemd.special.xml

@@ -429,7 +429,7 @@
             <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
             and
             <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
-            automatically setup the appropriate dependencies to make this happen.
+            automatically set up the appropriate dependencies to make this happen.
             </para>
 
             <xi:include href="version-info.xml" xpointer="v230"/>