minor #8956 Fixed invalid form validation reference (HeahDude, javiereguiluz)

This PR was merged into the 2.7 branch.

Discussion
----------

Fixed invalid form validation reference

Continue #8940.

Commits
-------

2af182d Reword
2b904b7 Fixed invalid form validation reference

Author: javiereguiluz

form/disabling_validation.rst

@@ -21,5 +21,10 @@ these cases you can set the ``validation_groups`` option to ``false``::
 
 Note that when you do that, the form will still run basic integrity checks,
 for example whether an uploaded file was too large or whether non-existing
-fields were submitted. If you want to suppress validation, you can use the
-:ref:`POST_SUBMIT event <form-dynamic-form-modification-suppressing-form-validation>`.
+fields were submitted.
+
+The submission of extra form fields can be controlled with the
+`allow_extra_fields config option`_ and the maximum upload file size should be
+handled via your PHP and web server configuration.
+
+.. _`allow_extra_fields config option`: https://symfony.com/doc/current/reference/forms/types/form.html#allow-extra-fields

form/dynamic_form_modification.rst

@@ -702,11 +702,3 @@ field according to the current selection in the ``sport`` field:
 The major benefit of submitting the whole form to just extract the updated
 ``position`` field is that no additional server-side code is needed; all the
 code from above to generate the submitted form can be reused.
-
-.. _form-dynamic-form-modification-suppressing-form-validation:
-
-Suppressing Form Validation
----------------------------
-
-To suppress form validation, set ``validation_groups`` to ``false`` or an empty
-array.