fix internal link syntax

Author: landsman

best_practices.rst

@@ -160,7 +160,7 @@ values is that it's complicated to redefine their values in your tests.
 Business Logic
 --------------
 
-Don't Create any Bundle to Organize your Application Logic
+.. _best-practice-no-application-bundles::Don't Create any Bundle to Organize your Application Logic
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 When Symfony 2.0 was released, applications used :doc:`bundles </bundles>` to

bundles.rst

@@ -6,7 +6,7 @@ The Bundle System
 .. caution::
 
     In Symfony versions prior to 4.0, it was recommended to organize your own
-    application code using bundles. This is `no longer recommended <https://symfony.com/doc/current/best_practices.html#don-t-create-any-bundle-to-organize-your-application-logic>`_ and bundles
+    application code using bundles. This is :ref:`no longer recommended <best-practice-no-application-bundles>`_ and bundles
     should only be used to share code and features between multiple applications.
 
 A bundle is similar to a plugin in other software, but even better. The core