docs: improve $builder->insert() description

Author: kenjis

user_guide_src/source/database/query_builder.rst

@@ -829,15 +829,17 @@ method. Here is an example using an array:
 
 The first parameter is an associative array of values.
 
+.. note:: All values except ``RawSql`` are escaped automatically producing safer queries.
+
+.. warning:: When you use ``RawSql``, you MUST escape the data manually. Failure to do so could result in SQL injections.
+
 Here is an example using an object:
 
 .. literalinclude:: query_builder/077.php
 
-The first parameter is an object.
+.. literalinclude:: query_builder/121.php
 
-.. note:: All values except ``RawSql`` are escaped automatically producing safer queries.
-
-.. warning:: When you use ``RawSql``, you MUST escape the data manually. Failure to do so could result in SQL injections.
+The first parameter is an object.
 
 $builder->ignore()
 ------------------

user_guide_src/source/database/query_builder/077.php

@@ -2,13 +2,9 @@
 
 namespace App\Libraries;
 
-class Myclass
+class MyClass
 {
     public $title   = 'My Title';
     public $content = 'My Content';
     public $date    = 'My Date';
 }
-
-$object = new Myclass();
-$builder->insert($object);
-// Produces: INSERT INTO mytable (title, content, date) VALUES ('My Title', 'My Content', 'My Date')

user_guide_src/source/database/query_builder/121.php

@@ -0,0 +1,7 @@
+<?php
+
+use App\Libraries\MyClass;
+
+$object = new MyClass();
+$builder->insert($object);
+// Produces: INSERT INTO mytable (title, content, date) VALUES ('My Title', 'My Content', 'My Date')