remove duplicated code block

Author: xabbuh

reference/constraints/Collection.rst

@@ -184,29 +184,6 @@ you can do the following:
 
 .. configuration-block::
 
-    .. code-block:: php-attributes
-
-        // src/Entity/Author.php
-        namespace App\Entity;
-
-        use Symfony\Component\Validator\Constraints as Assert;
-
-        class Author
-        {
-            #[Assert\Collection(
-                fields: [
-                    'personal_email' => new Assert\Required([
-                        new Assert\NotBlank,
-                        new Assert\Email,
-                    ]),
-                    'alternate_email' => new Assert\Optional(
-                        new Assert\Email
-                    ),
-                ],
-            )]
-            protected $profileData = ['personal_email' => 'email@example.com'];
-        }
-
     .. code-block:: php-attributes
 
         // src/Entity/Author.php