Fixed doc syntax

Author: javiereguiluz

form/form_collections.rst

@@ -51,8 +51,6 @@ Let's start by creating a ``Task`` entity::
 Now, create a ``Tag`` class. As you saw above, a ``Task`` can have many ``Tag``
 objects::
 
-.. code-block:: php
-
  // src/Entity/Tag.php
  namespace App\Entity;