minor #8920 [Form] input=datetime_immutable for DateType, TimeType, DateTimeType (vudaltsov)

This PR was merged into the master branch.

Discussion
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[Form] input=datetime_immutable for DateType, TimeType, DateTimeType

Related to symfony/symfony#25582.

Commits
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f6bf5f2 Added input=datetime_immutable for DateType, TimeType, DateTimeType.

Author: javiereguiluz

reference/forms/types/datetime.rst

@@ -125,6 +125,7 @@ on your underlying object. Valid values are:
 
 * ``string`` (e.g. ``2011-06-05 12:15:00``)
 * ``datetime`` (a ``DateTime`` object)
+* ``datetime_immutable`` (a ``DateTimeImmutable`` object)
 * ``array`` (e.g. ``array(2011, 06, 05, 12, 15, 0)``)
 * ``timestamp`` (e.g. ``1307276100``)
 

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

@@ -8,6 +8,7 @@ on your underlying object. Valid values are:
 
 * ``string`` (e.g. ``2011-06-05``)
 * ``datetime`` (a ``DateTime`` object)
+* ``datetime_immutable`` (a ``DateTimeImmutable`` object)
 * ``array`` (e.g. ``array('year' => 2011, 'month' => 06, 'day' => 05)``)
 * ``timestamp`` (e.g. ``1307232000``)
 

reference/forms/types/time.rst

@@ -120,6 +120,7 @@ on your underlying object. Valid values are:
 
 * ``string`` (e.g. ``12:17:26``)
 * ``datetime`` (a ``DateTime`` object)
+* ``datetime_immutable`` (a ``DateTimeImmutable`` object)
 * ``array`` (e.g. ``array('hour' => 12, 'minute' => 17, 'second' => 26)``)
 * ``timestamp`` (e.g. ``1307232000``)