docs: fix description for getXMLFromResult()

Author: kenjis

user_guide_src/source/database/utilities.rst

@@ -8,22 +8,26 @@ The Database Utility Class contains methods that help you manage your database.
     :local:
     :depth: 2
 
-*******************
-Get XML from Result
-*******************
 
-getXMLFromResult()
-==================
+Export a Query Result as an XML Document
+========================================
 
-This method returns the xml result from database result. You can do like this:
+Permits you to generate an XML file from a query result. The first
+parameter expects a query result object, the second may contain an
+optional array of config parameters. Example:
 
 .. literalinclude:: utilities/001.php
 
-and it will get the following xml result::
+and it will get the following xml result when the ``mytable`` has columns ``id`` and ``name``::
 
     <root>
         <element>
             <id>1</id>
             <name>bar</name>
         </element>
     </root>
+
+.. important:: This method will NOT write the XML file for you. It
+    simply creates the XML layout. If you need to write the file
+    use the :php:func:`write_file()` helper.
+

user_guide_src/source/database/utilities/001.php

@@ -1,13 +1,15 @@
 <?php
 
-class MyModel extends \CodeIgniter\Model
-{
-    protected $table      = 'foo';
-    protected $primaryKey = 'id';
-}
+$db     = db_connect();
+$dbutil = \CodeIgniter\Database\Config::utils();
 
-$model = new MyModel();
+$query = $db->query('SELECT * FROM mytable');
 
-$util = \CodeIgniter\Database\Config::utils();
+$config = [
+    'root'    => 'root',
+    'element' => 'element',
+    'newline' => "\n",
+    'tab'     => "\t",
+];
 
-echo $util->getXMLFromResult($model->get());
+echo $dbutil->getXMLFromResult($query, $config);