Restore bundles/best_practices.rst from 6.4 branch

Author: OskarStark

bundles/best_practices.rst

@@ -367,6 +367,8 @@ following standardized instructions in your ``README.md`` file.
                 <vendor>\<bundle-name>\<bundle-long-name>::class => ['all' => true],
             ];
 
+        .. _`installation chapter`: https://getcomposer.org/doc/00-intro.md
+
 The example above assumes that you are installing the latest stable version of
 the bundle, where you don't have to provide the package version number
 (e.g. ``composer require friendsofsymfony/user-bundle``). If the installation
@@ -559,7 +561,6 @@ Learn more
 * :doc:`/bundles/configuration`
 * :doc:`/frontend/create_ux_bundle`
 
-.. _`installation chapter`: https://getcomposer.org/doc/00-intro.md
 .. _`PSR-4`: https://www.php-fig.org/psr/psr-4/
 .. _`Symfony Flex recipe`: https://github.com/symfony/recipes
 .. _`Semantic Versioning Standard`: https://semver.org/