Minor tweak

Author: javiereguiluz

components/class_loader/psr4_class_loader.rst

@@ -22,7 +22,7 @@ Usage
 The following example demonstrates how you can use the
 :class:`Symfony\\Component\\ClassLoader\\Psr4ClassLoader` autoloader to use
 Symfony's Yaml component. Imagine, you downloaded both the ClassLoader and
-Yaml component as ZIP packages and unpacked them to a ``libs`` directory.
+Yaml component as ZIP packages and unpacked them to a ``lib/`` directory.
 The directory structure will look like this:
 
 .. code-block:: text