minor #5342 [Cookbook][Bundles] clarify bundle installation instructions (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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[Cookbook][Bundles] clarify bundle installation instructions

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | no
| Applies to    | all
| Fixed tickets | symfony/monolog-bundle#124 (comment)

Commits
-------

5a33e0e clarify bundle installation instructions

Author: weaverryan

cookbook/bundles/best_practices.rst

@@ -230,8 +230,8 @@ following standardized instructions in your ``README.md`` file.
         Step 2: Enable the Bundle
         -------------------------
 
-        Then, enable the bundle by adding the following line in the `app/AppKernel.php`
-        file of your project:
+        Then, enable the bundle by adding it to the list of registered bundles
+        in the `app/AppKernel.php` file of your project:
 
         ```php
         <?php
@@ -276,8 +276,8 @@ following standardized instructions in your ``README.md`` file.
         Step 2: Enable the Bundle
         -------------------------
 
-        Then, enable the bundle by adding the following line in the ``app/AppKernel.php``
-        file of your project:
+        Then, enable the bundle by adding it to the list of registered bundles
+        in the ``app/AppKernel.php`` file of your project:
 
         .. code-block:: php