Act on field_attach_presave().
This hook is invoked after the field module has performed the operation.
\Drupal\Core\Entity\EntityInterface $entity: the entity with fields to process.
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
function hook_field_attach_presave(\Drupal\Core\Entity\EntityInterface $entity) {
// @todo Needs function body.
}