docs: remove incorrect description

`APPPATH . 'Config'` does not have a trailing back slash.

Author: kenjis

user_guide_src/source/concepts/autoloader.rst

@@ -53,8 +53,7 @@ those classes can be found in:
 .. literalinclude:: autoloader/001.php
 
 The key of each row is the namespace itself. This does not need a trailing back slash.
-The value is the location to the directory the classes can be found in. They should
-have a trailing slash.
+The value is the location to the directory the classes can be found in.
 
 .. note:: You can check the namespace configuration by ``spark namespaces`` command::