related to #1693 changed smarty version to 4.1.0

include/smarty/docs/programmers/api-variables/variable-config-dir.md

@@ -0,0 +1,23 @@
+\$config\_dir {#variable.config.dir}
+=============
+
+This is the directory used to store [config files](#config.files) used
+in the templates. Default is `./configs`, meaning that Smarty will look
+for the `configs/` directory in the same directory as the executing php
+script.
+
+> **Note**
+>
+> It is not recommended to put this directory under the web server
+> document root.
+
+> **Note**
+>
+> As of Smarty 3.1 the attribute \$config\_dir is no longer accessible
+> directly. Use [`getConfigDir()`](#api.get.config.dir),
+> [`setConfigDir()`](#api.set.config.dir) and
+> [`addConfigDir()`](#api.add.config.dir) instead.
+
+See also [`getConfigDir()`](#api.get.config.dir),
+[`setConfigDir()`](#api.set.config.dir) and
+[`addConfigDir()`](#api.add.config.dir).