MDL-33791 - fix upgrade.txt ordering

portfolio/upgrade.txt

@@ -1,13 +1,6 @@
 This files describes API changes in /portfolio/ portfolio system,
 information provided here is intended especially for developers.
 
-=== 2.3 ===
-
-required changes:
-* The following methods must now be declared static for php5 compatibility:
-    - admin_config_form
-    - admin_config_validation
-
 === 2.4 ===
 
 The set_callback_options function's third parameter has been changed from a file path
@@ -23,4 +16,11 @@ $button->set_callback_options('assignment_portfolio_caller', array('id' => $this
 
 Now becomes:
 
-$button->set_callback_options('assignment_portfolio_caller', array('id' => $this->cm->id, 'fileid' => $file->get_id()), 'mod_assignment');
+$button->set_callback_options('assignment_portfolio_caller', array('id' => $this->cm->id, 'fileid' => $file->get_id()), 'mod_assignment');
+
+=== 2.3 ===
+
+required changes:
+* The following methods must now be declared static for php5 compatibility:
+    - admin_config_form
+    - admin_config_validation