[5006] Minor fixes to PDF output

Move Kea logo to left of title in the header.  Also fix an incorrect
cross-reference link in the DHCPv4 chapter.

doc/guide/dhcp4-srv.xml

@@ -478,8 +478,8 @@ If a timeout is given though, it should be an integer greater than zero.
 </section>
 </section>
 
-<section>
-  <title id="hosts-storage4">Hosts Storage</title>
+<section id="hosts-storage4">
+  <title>Hosts Storage</title>
 
     <para>Kea is also able to store information about host reservations in the
     database. The hosts database configuration uses the same syntax as the lease

doc/guide/kea-guide.xml

@@ -20,12 +20,12 @@
   <bookinfo>
 
     <title>
-    Kea Administrator Reference Manual
     <inlinemediaobject>
         <imageobject>
             <imagedata fileref="kea-logo-100x70.png" align="left"/>
         </imageobject>
     </inlinemediaobject>
+    Kea Administrator Reference Manual
     </title>
 
     <releaseinfo>This is the reference guide for Kea version