Reword

Author: javiereguiluz

forms.rst

@@ -317,21 +317,17 @@ valid, but whether or not the ``$task`` object is valid after the form has
 applied the submitted data to it. Calling ``$form->isValid()`` is a shortcut
 that asks the ``$task`` object whether or not it has valid data.
 
-Validation is done by adding a set of rules (called constraints) to a class. To
-see this in action, add validation constraints so that the ``task`` field cannot
-be empty and the ``dueDate`` field cannot be empty and must be a valid \DateTime
-object.
-
-Installation
-------------
-
-In applications using :doc:`Symfony Flex </setup/flex>`, run this command to
-install the validator feature before using it:
+Before using validation, add support for it in your application:
 
 .. code-block:: terminal
 
     $ composer require validator
 
+Validation is done by adding a set of rules (called constraints) to a class. To
+see this in action, add validation constraints so that the ``task`` field cannot
+be empty and the ``dueDate`` field cannot be empty and must be a valid \DateTime
+object.
+
 .. configuration-block::
 
     .. code-block:: php-annotations