Update index.rst

For new Cakephp users it is not clear that database config for debug_kit should be placed under Datasources.

Should the file reference "config/app.php" also be changed to config/app_local.php ?

Author: davidspeijer

docs/en/index.rst

@@ -56,7 +56,7 @@ Database Configuration
 By default DebugKit will store panel data into a SQLite database in your
 application's ``tmp`` directory. If you cannot install pdo_sqlite, you can
 configure DebugKit to use a different database by defining a ``debug_kit``
-connection in your **config/app.php** file. For example::
+connection in the ``Datasources`` variable in your **config/app.php** file. For example::
 
     /**
      * The debug_kit connection stores DebugKit meta-data.