man-db: decorate username bin

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11769 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/man-db.xml

@@ -89,7 +89,7 @@
         <term><parameter>--enable-cache-owner=bin</parameter></term>
         <listitem>
           <para>This makes the system-wide cache files be owned by user
-          bin.</para>
+          <systemitem class="username">bin</systemitem>.</para>
         </listitem>
       </varlistentry>