minor #18899 [Messenger] Remove an unneeded tip about Doctrine migrations and schema_filter (javiereguiluz)

This PR was merged into the 5.4 branch.

Discussion
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[Messenger] Remove an unneeded tip about Doctrine migrations and schema_filter

Fixes #18328.

Commits
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c0665ed [Messenger] Remove an unneeded tip about Doctrine migrations and schema_filter

Author: javiereguiluz

messenger.rst

@@ -1459,36 +1459,6 @@ DSN by using the ``table_name`` option:
 Or, to create the table yourself, set the ``auto_setup`` option to ``false`` and
 :ref:`generate a migration <doctrine-creating-the-database-tables-schema>`.
 
-.. tip::
-
-    To avoid tools like Doctrine Migrations from trying to remove this table because
-    it's not part of your normal schema, you can set the ``schema_filter`` option:
-
-    .. configuration-block::
-
-        .. code-block:: yaml
-
-            # config/packages/doctrine.yaml
-            doctrine:
-                dbal:
-                    schema_filter: '~^(?!messenger_messages)~'
-
-        .. code-block:: xml
-
-            <!-- config/packages/doctrine.xml -->
-            <doctrine:dbal schema-filter="~^(?!messenger_messages)~"/>
-
-        .. code-block:: php
-
-            # config/packages/doctrine.php
-            $container->loadFromExtension('doctrine', [
-                'dbal' => [
-                    'schema_filter'  => '~^(?!messenger_messages)~',
-                    // ...
-                ],
-                // ...
-            ]);
-
 .. caution::
 
     The datetime property of the messages stored in the database uses the