Merge branch '5.1' into 5.2

* 5.1:
  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;