DATAMONGO-366 - Polished reference documentation.

Fixed link to bug tracker. Polished docbook files a bit.

src/docbkx/introduction/getting-started.xml

@@ -51,7 +51,7 @@
 
     <para>If you encounter a bug or want to suggest an improvement, please
     create a ticket on the Spring Data issue <ulink
-    url="https://jira.springframework.org/browse/DATAKV">tracker</ulink>.</para>
+    url="https://jira.springframework.org/browse/DATAMONGO">tracker</ulink>.</para>
 
     <para>To stay up to date with the latest news and announcements in the
     Spring eco system, subscribe to the Spring Community <ulink

src/docbkx/introduction/introduction.xml

@@ -86,7 +86,5 @@
           Book</ulink>"</para>
         </listitem>
       </itemizedlist>
-
-      <para />
     </section></para>
 </partintro>

src/docbkx/reference/introduction.xml

@@ -1,3 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+    "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
 <partintro>
   <title>Document Structure</title>
 
@@ -15,6 +18,4 @@
     introduces the repository support for MongoDB.
   </para>
 
-  <!-- <para><xref linkend="couch.core"/> introduces the CouchDB module feature set.</para> -->
-
 </partintro>