Add a short mention to apache-pack in the web server docs

Author: javiereguiluz

setup/web_server_configuration.rst

@@ -95,6 +95,14 @@ directive to pass requests for PHP files to PHP FPM:
         CustomLog /var/log/apache2/project_access.log combined
     </VirtualHost>
 
+.. note::
+
+    If you run Apache via ``mod_php`` and without using PHP-FPM, you can run
+    ``composer require symfony/apache-pack`` to create an ``.htaccess`` file in
+    the ``public/`` directory with the rewrite rules needed to serve the Symfony
+    application. In production, move these rules to the main Apache configuration
+    file to improve performance.
+
 Nginx
 -----