[Reference][Form Types] Add missing docs for "action" and "method" option

Author: bicpi

reference/forms/types/form.rst

@@ -59,3 +59,6 @@ on all fields.
 
 .. include:: /reference/forms/types/options/invalid_message_parameters.rst.inc
 
+.. include:: /reference/forms/types/options/action.rst.inc
+
+.. include:: /reference/forms/types/options/method.rst.inc

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

@@ -0,0 +1,11 @@
+.. versionadded:: 2.3
+    The ``action`` option was introduced in Symfony 2.3.
+
+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
+will be submitted to the same URI that rendered the form.

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

@@ -0,0 +1,20 @@
+.. versionadded:: 2.3
+    The ``method`` option was introduced in Symfony 2.3.
+
+method
+~~~~~~
+
+**type**: ``string`` **default**: ``POST``
+
+This option specifies the HTTP method used to submit the form's data. Possible
+values are:
+
+* POST
+* GET
+* PUT
+* DELETE
+* PATCH
+
+.. note::
+    Using ``PUT``, ``PATCH`` and ``DELETE`` is only allowed if
+    :ref:`configuration-framework-http_method_override` is enabled.