Correct sample index config, xmlns placement info

Fixing the index config and discussion thereof reminded me of a discussion on exist-open https://markmail.org/message/jjzubo2tpe3augg6, which prompted Wolfgang to relax the restriction that had been documented here. See his commit at eXist-db/exist@49268ef.

Author: joewiz

src/main/xar-resources/data/indexing/indexing.xml

@@ -3,7 +3,7 @@
         schematypens="http://purl.oclc.org/dsdl/schematron"?><article xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0">
     <info>
         <title>Configuring Database Indexes</title>
-        <date>2Q19</date>
+        <date>2Q21</date>
         <keywordset>
             <keyword>application-development</keyword>
         </keywordset>
@@ -174,16 +174,14 @@
                 types of indexes: full text, range and ngram.</para>
 
             <para>If the document to be indexed uses namespaces, you should add a
-                <literal>xmlns</literal> declaration for each of the required namespaces to the
-                <tag>index</tag> element:</para>
+                <literal>xmlns</literal> declaration for each of the required namespaces:</para>
 
             <programlisting language="xml" xlink:href="listings/listing-4.xml"/>
             <para>The example configuration above creates two indexes on a collection of atom
                 documents. The two elements which should be indexed are both in the
                 <literal>atom</literal> namespace and we therefore need to declare a mapping for
-                this namespace. Please note that the <literal>xmlns</literal> namespace declarations
-                have to be specified on the <tag>index</tag> element, not the <tag>create</tag> or
-                <tag>fulltext</tag> elements.</para>
+                this namespace. Here, the namespace mapping is placed on the <tag>index</tag> 
+                element, but it can appear anywhere in the configuration document.</para>
         </sect2>
     </sect1>
 

src/main/xar-resources/data/indexing/listings/listing-4.xml

@@ -1,7 +1,7 @@
 <collection xmlns="http://exist-db.org/collection-config/1.0">
   <index xmlns:atom="http://www.w3.org/2005/Atom">
     <lucene>
-      <create qname="atom:title"/>
+      <text qname="atom:title"/>
     </lucene>
     <range>
       <create qname="atom:id" type="xs:string"/>