added missing DateFilter::INCLUDE_NULL_BEFORE_AND_AFTER

Author: OskarStark

core/filters.md

@@ -241,6 +241,7 @@ Use the default behavior of the DBMS | `null`
 Exclude items                        | `ApiPlatform\Core\Bridge\Doctrine\Orm\Filter\DateFilter::EXCLUDE_NULL` (`exclude_null`)
 Consider items as oldest             | `ApiPlatform\Core\Bridge\Doctrine\Orm\Filter\DateFilter::INCLUDE_NULL_BEFORE` (`include_null_before`)
 Consider items as youngest           | `ApiPlatform\Core\Bridge\Doctrine\Orm\Filter\DateFilter::INCLUDE_NULL_AFTER` (`include_null_after`)
+Take items always into account       | `ApiPlatform\Core\Bridge\Doctrine\Orm\Filter\DateFilter::INCLUDE_NULL_BEFORE_AND_AFTER` (`include_null_before_and_after`)
 
 For instance, exclude entries with a property value of `null`, with the following service definition: