docs: add explanation and links

Author: kenjis

user_guide_src/source/general/common_functions.rst

@@ -107,6 +107,11 @@ Service Accessors
     :returns: The model instances
     :rtype: object
 
+    More simple way of getting model instances.
+
+    The ``model()`` uses ``Factories::models()`` internally.
+    See :ref:`factories-example` for details on the first parameter ``$name``.
+
     See also the :ref:`Using CodeIgniter's Model <accessing-models>`.
 
 .. php:function:: old($key[, $default = null,[, $escape = 'html']])

user_guide_src/source/models/model.rst

@@ -28,6 +28,9 @@ You can access models within your classes by creating a new instance or using th
 
 .. literalinclude:: model/001.php
 
+The ``model()`` uses ``Factories::models()`` internally.
+See :ref:`factories-example` for details on the first parameter.
+
 CodeIgniter's Model
 *******************