Improve descriptions

Author: bicpi

reference/forms/types/options/action.rst.inc

@@ -7,5 +7,6 @@ action
 **type**: ``string`` **default**: empty string
 
 This option specifies where to send the form's data on submission (usually an
-URI). An empty value is considered a same-document references, i.e. the form
+URI). It's value is rendered as the ``action`` attribute of the ``form``
+element. An empty value is considered a same-document reference, i.e. the form
 will be submitted to the same URI that rendered the form.

reference/forms/types/options/method.rst.inc

@@ -6,15 +6,19 @@ method
 
 **type**: ``string`` **default**: ``POST``
 
-This option specifies the HTTP method used to submit the form's data. Possible
-values are:
+This option specifies the HTTP method used to submit the form's data. It's
+value is rendered as the ``method`` attribute of the ``form`` element.
+Possible values are:
 
 * POST
 * GET
 * PUT
 * DELETE
 * PATCH
 
+As PUT, DELETE and PATCH are not nativly supported by most clients, Symfony
+simulates them, see :doc:`/cookbook/routing/method_parameters`.
+
 .. note::
     Using ``PUT``, ``PATCH`` and ``DELETE`` is only allowed if
     :ref:`configuration-framework-http_method_override` is enabled.