Remove the flags example in YAML and XML because it doesn't work

Author: javiereguiluz

reference/constraints/Yaml.rst

@@ -109,34 +109,6 @@ Its value is a combination of one or more of the :ref:`flags defined by the Yaml
             private string $customConfiguration;
         }
 
-    .. code-block:: yaml
-
-        # config/validator/validation.yaml
-        App\Entity\Report:
-            properties:
-                customConfiguration:
-                    - Yaml:
-                        message: Your configuration doesn't have valid YAML syntax.
-                        flags: YamlParser::PARSE_CONSTANT | YamlParser::PARSE_CUSTOM_TAGS | Yaml::PARSE_DATETIME
-
-    .. code-block:: xml
-
-        <!-- config/validator/validation.xml -->
-        <?xml version="1.0" encoding="UTF-8" ?>
-        <constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping"
-            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-            xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping https://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">
-
-            <class name="App\Entity\Report">
-                <property name="customConfiguration">
-                    <constraint name="Yaml">
-                        <option name="message">Your configuration doesn't have valid YAML syntax.</option>
-                        <option name="flags">Yaml::PARSE_CONSTANT | Yaml::PARSE_CUSTOM_TAGS | Yaml::PARSE_DATETIME</option>
-                    </constraint>
-                </property>
-            </class>
-        </constraint-mapping>
-
     .. code-block:: php
 
         // src/Entity/Report.php