Merge pull request #3256 from WouterJ/clarify_checking

[#3255] Tried to clarify how to check a box

Author: weaverryan

reference/forms/types/checkbox.rst

@@ -13,8 +13,9 @@ if the box is unchecked, the value will be set to false.
 +-------------+------------------------------------------------------------------------+
 | Options     | - `value`_                                                             |
 +-------------+------------------------------------------------------------------------+
-| Inherited   | - `required`_                                                          |
-| options     | - `label`_                                                             |
+| Inherited   | - `data`_                                                              |
+| options     | - `required`_                                                          |
+|             | - `label`_                                                             |
 |             | - `read_only`_                                                         |
 |             | - `disabled`_                                                          |
 |             | - `error_bubbling`_                                                    |
@@ -47,11 +48,17 @@ value
 The value that's actually used as the value for the checkbox. This does
 not affect the value that's set on your object.
 
+.. caution::
+
+    To make a checkbox checked by default, use the `data`_ option.
+
 Inherited options
 -----------------
 
 These options inherit from the :doc:`form </reference/forms/types/form>` type:
 
+.. include:: /reference/forms/types/options/data.rst.inc
+
 .. include:: /reference/forms/types/options/required.rst.inc
 
 .. include:: /reference/forms/types/options/label.rst.inc

reference/forms/types/radio.rst

@@ -17,8 +17,9 @@ If you want to have a Boolean field, use :doc:`checkbox </reference/forms/types/
 +-------------+---------------------------------------------------------------------+
 | Options     | - `value`_                                                          |
 +-------------+---------------------------------------------------------------------+
-| Inherited   | - `required`_                                                       |
-| options     | - `label`_                                                          |
+| Inherited   | - `data`_                                                           |
+| options     | - `required`_                                                       |
+|             | - `label`_                                                          |
 |             | - `read_only`_                                                      |
 |             | - `disabled`_                                                       |
 |             | - `error_bubbling`_                                                 |
@@ -41,11 +42,17 @@ value
 The value that's actually used as the value for the radio button. This does
 not affect the value that's set on your object.
 
+.. caution::
+
+    To make a radio button checked by default, use the `data`_ option.
+
 Inherited Options
 -----------------
 
 These options inherit from the :doc:`form </reference/forms/types/form>` type:
 
+.. include:: /reference/forms/types/options/data.rst.inc
+
 .. include:: /reference/forms/types/options/required.rst.inc
 
 .. include:: /reference/forms/types/options/label.rst.inc