minor #12463 [Form] Changed the ISO Code and example for LanguageType (creiner)

This PR was merged into the 4.4 branch.

Discussion
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[Form] Changed the ISO Code and example for LanguageType

As discussed in the previous PR here:
#12441

Commits
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4b76e73 Changed the ISO Code and example for LanguageType

Author: javiereguiluz

reference/forms/types/country.rst

@@ -63,7 +63,21 @@ the option manually, but then you should just use the ``ChoiceType`` directly.
 Field Options
 -------------
 
-.. include:: /reference/forms/types/options/alpha3.rst.inc
+alpha3
+~~~~~~
+
+**type**: ``boolean`` **default**: ``false``
+
+.. versionadded:: 4.4
+
+    The ``alpha3`` option was introduced in Symfony 4.4.
+
+If this option is ``true``, the choice values use the `ISO 3166-1 alpha-3`_
+three-letter codes (e.g. New Zealand = ``NZL``) instead of the default
+`ISO 3166-1 alpha-2`_ two-letter codes (e.g. New Zealand = ``NZ``).
+
+.. _`ISO 3166-1 alpha-2`: https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
+.. _`ISO 3166-1 alpha-3`: https://en.wikipedia.org/wiki/ISO_3166-1_alpha-3
 
 .. include:: /reference/forms/types/options/choice_translation_locale.rst.inc
 

reference/forms/types/language.rst

@@ -65,7 +65,21 @@ manually, but then you should just use the ``ChoiceType`` directly.
 Field Options
 -------------
 
-.. include:: /reference/forms/types/options/alpha3.rst.inc
+alpha3
+~~~~~~
+
+**type**: ``boolean`` **default**: ``false``
+
+.. versionadded:: 4.4
+
+    The ``alpha3`` option was introduced in Symfony 4.4.
+
+If this option is ``true``, the choice values use the `ISO 639-2 alpha-3`_
+three-letter codes (e.g. French = ``fra``) instead of the default
+`ISO 639-1 alpha-2`_ two-letter codes (e.g. French = ``fr``).
+
+.. _`ISO 639-1 alpha-2`: https://en.wikipedia.org/wiki/ISO_639-1
+.. _`ISO 639-2 alpha-3`: https://en.wikipedia.org/wiki/ISO_639-2
 
 .. include:: /reference/forms/types/options/choice_translation_locale.rst.inc