Fix extension order in UPGRADING.INTERNALS

Author: TimWolla

UPGRADING.INTERNALS

@@ -84,12 +84,6 @@ PHP 8.6 INTERNALS UPGRADE NOTES
 3. Module changes
 ========================
 
-- ext/xml:
-  . Removed the XML_ExpatVersion() libxml compatibility wrapper,
-    as it was unused.
-  . Removed the XML_GetCurrentByteCount() libxml compatibility wrapper,
-    as it was unused and could return the wrong result.
-
 - ext/mbstring:
   . Added GB18030-2022 to default encoding list for zh-CN.
 
@@ -111,6 +105,12 @@ PHP 8.6 INTERNALS UPGRADE NOTES
   . _php_error_log_ex() has been removed.
   . php_mail()'s extra_cmd parameter is now a zend_string*.
 
+- ext/xml:
+  . Removed the XML_ExpatVersion() libxml compatibility wrapper,
+    as it was unused.
+  . Removed the XML_GetCurrentByteCount() libxml compatibility wrapper,
+    as it was unused and could return the wrong result.
+
 ========================
 4. OpCode changes
 ========================