minor #14121 Update using_components.rst (noniagriconomie)

This PR was submitted for the 3.4 branch but it was squashed and merged into the 4.4 branch instead.

Discussion
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Update using_components.rst

Small improvement on this doc entry point

Commits
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fca061e Update using_components.rst

Author: javiereguiluz

components/using_components.rst

@@ -20,7 +20,7 @@ Using the Finder Component
 
 **1.** If you're creating a new project, create a new empty directory for it.
 
-**2.** Open a terminal and use Composer to grab the library.
+**2.** Open a terminal, step into this directory and use Composer to grab the library.
 
 .. code-block:: terminal
 
@@ -43,26 +43,36 @@ the ``vendor/autoload.php`` file that was generated by Composer. This file
 takes care of autoloading all of the libraries so that you can use them
 immediately::
 
-    // File example: src/script.php
-
-    // update this to the path to the "vendor/"
-    // directory, relative to this file
+    // Project structure example:
+    // my_project/
+    //     data/
+    //         ...              # Some project data
+    //     src/
+    //         my_script.php    # Main entry point
+    //     vendor/
+    //         autoload.php     # Autoloader generated by Composer
+    //         ...              # Packages downloaded by Composer
+
+    // File example: src/my_script.php
+    // Autoloader relative path to this PHP file
     require_once __DIR__.'/../vendor/autoload.php';
 
     use Symfony\Component\Finder\Finder;
 
     $finder = new Finder();
     $finder->in('../data/');
 
-    // ...
+    // rest of your PHP code...
 
 Now what?
 ---------
 
 Now, the component is installed and autoloaded. Read the specific component's
 documentation to find out more about how to use it.
+All `Symfony Components`_ are documented here as standalone libraries.
 
 And have fun!
 
 .. _Composer: https://getcomposer.org
 .. _Install Composer: https://getcomposer.org/download/
+.. _Symfony Components: https://symfony.com/components