minor #6260 add missing options choice_value, choice_name and choice_attr to EntityType (HeahDude)

This PR was merged into the 2.7 branch.

Discussion
----------

add missing options `choice_value`, `choice_name` and `choice_attr` to `EntityType`

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no (& yes symfony/symfony#17694)
| Applies to    | 2.7+
| Fixed tickets | #6259

Commits
-------

9785f08 add missing options `choice_value`, `choice_name` and `choice_attr` to `EntityType`

Author: xabbuh

reference/forms/types/entity.rst

@@ -22,6 +22,9 @@ objects from the database.
 +-------------+------------------------------------------------------------------+
 | Inherited   | from the :doc:`choice </reference/forms/types/choice>` type:     |
 | options     |                                                                  |
+|             | - `choice_value`_                                                |
+|             | - `choice_name`_                                                 |
+|             | - `choice_attr`_                                                 |
 |             | - `placeholder`_                                                 |
 |             | - `choice_translation_domain`_                                   |
 |             | - `translation_domain`_                                          |
@@ -195,6 +198,12 @@ Inherited Options
 These options inherit from the :doc:`choice </reference/forms/types/choice>`
 type:
 
+.. include:: /reference/forms/types/options/choice_value.rst.inc
+
+.. include:: /reference/forms/types/options/choice_name.rst.inc
+
+.. include:: /reference/forms/types/options/choice_attr.rst.inc
+
 .. include:: /reference/forms/types/options/placeholder.rst.inc
 
 .. include:: /reference/forms/types/options/choice_translation_domain.rst.inc