minor #6090 Reworded the article about profiler storage (xavierleune, javiereguiluz)

This PR was merged into the 3.0 branch.

Discussion
----------

Reworded the article about profiler storage

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 3.0+
| Fixed tickets | -

This finishes #6024.

Commits
-------

bcbb87f Fixed the Symfony version number
bcc5634 Finished the rewording of the "profiler storage" article
32a63d8 ProfilerStorage configuration

Author: xabbuh

cookbook/profiler/storage.rst

@@ -4,66 +4,21 @@
 Switching the Profiler Storage
 ==============================
 
-By default the profile stores the collected data in files in the ``%kernel.cache_dir%/profiler/`` directory.
-You can control the storage being used through the ``dsn``, ``username``,
-``password`` and ``lifetime`` options. For example, the following configuration
-uses MySQL as the storage for the profiler with a lifetime of one hour:
+In Symfony versions previous to 3.0, profiles could be stored in files, databases,
+services like Redis and Memcache, etc. Starting from Symfony 3.0, the only storage
+mechanism with built-in support is the filesystem.
 
-.. configuration-block::
+By default the profile stores the collected data in the ``%kernel.cache_dir%/profiler/``
+directory. If you want to use another location to store the profiles, define the
+``dsn`` option of the ``framework.profiler``:
 
-    .. code-block:: yaml
+.. code-block:: yaml
 
-        # app/config/config.yml
-        framework:
-            profiler:
-                dsn:      'mysql:host=localhost;dbname=%database_name%'
-                username: '%database_user%'
-                password: '%database_password%'
-                lifetime: 3600
+    # app/config/config.yml
+    framework:
+        profiler:
+            dsn: 'file:/tmp/symfony/profiler'
 
-    .. code-block:: xml
-
-        <!-- app/config/config.xml -->
-        <?xml version="1.0" encoding="UTF-8" ?>
-        <container xmlns="http://symfony.com/schema/dic/services"
-            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-            xmlns:framework="http://symfony.com/schema/dic/symfony"
-            xsi:schemaLocation="http://symfony.com/schema/dic/services
-                http://symfony.com/schema/dic/services/services-1.0.xsd
-                http://symfony.com/schema/dic/symfony
-                http://symfony.com/schema/dic/symfony/symfony-1.0.xsd"
-        >
-            <framework:config>
-                <framework:profiler
-                    dsn="mysql:host=localhost;dbname=%database_name%"
-                    username="%database_user%"
-                    password="%database_password%"
-                    lifetime="3600"
-                />
-            </framework:config>
-        </container>
-
-    .. code-block:: php
-
-        // app/config/config.php
-
-        // ...
-        $container->loadFromExtension('framework', array(
-            'profiler' => array(
-                'dsn'      => 'mysql:host=localhost;dbname=%database_name%',
-                'username' => '%database_user',
-                'password' => '%database_password%',
-                'lifetime' => 3600,
-            ),
-        ));
-
-The :doc:`HttpKernel component </components/http_kernel/introduction>` currently
-supports the following profiler storage drivers:
-
-* file
-* sqlite
-* mysql
-* mongodb
-* memcache
-* memcached
-* redis
+You can also create your own profile storage service implementing the
+:class:``Symfony\Component\HttpKernel\Profiler\ProfilerStorageInterface`` and
+overriding the ``profiler.storage`` service.