Remove an instruction in man-db no longer needed

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11398 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/man-db.xml

@@ -109,11 +109,11 @@
     <para>Install the package:</para>
 
 <screen><userinput remap="install">make install</userinput></screen>
-
+<!--
     <para revision="systemd">Remove a reference to a non-existent user:</para>
 
 <screen revision="systemd"><userinput remap="install">sed -i "s:man man:root root:g" /usr/lib/tmpfiles.d/man-db.conf</userinput></screen>
-
+-->
   </sect2>
 
   <sect2>