Another reword

Author: javiereguiluz

reference/constraints/Timezone.rst

@@ -103,15 +103,16 @@ The value of this option must be a valid `ISO 3166-1 alpha-2`_ country code
 intlCompatible
 ~~~~~~~~~~~~~~
 
-**type**: ``boolean`` **default**: depends on your application
+**type**: ``boolean`` **default**: ``false``
 
-If ``false``, only the `PHP timezone identifiers`_ are considered valid. If
-``true``, the :ref:`ICU timezones <component-inlt-timezones>` provided by the
-Intl component are considered valid too.
+This constraint considers valid both the `PHP timezone identifiers`_ and the
+:ref:`ICU timezones <component-inlt-timezones>` provided by Symfony's
+:doc:`Intl component </components/intl>`
 
-The default value of this option depends on your application. If the
-:doc:`Intl component </components/intl>` is available in the application, the
-default value is ``true``; otherwise, it's ``false`` by default.
+However, the timezones provided by the Intl component can be different from the
+timezones provided by PHP's Intl extension because the ICU versions can be
+different. If this option is set to ``true``, this constraint also considers
+valid any PHP ``\IntlTimeZone`` value.
 
 message
 ~~~~~~~