dependent children wording to make it clear this is used to compute allocation

src/Admin/AdherentAdmin.php

@@ -219,7 +219,7 @@ class AdherentAdmin extends AbstractAdmin
                                 'allow_add' => true,
                                 'allow_delete' => true,
                                 'by_reference' => false,
-                                'label' => "Enfant(s) à charge"
+                                'label' => "Enfant(s) à charge (pour calculer l'allocation)"
                             ])
                         ->end()
                     ->end();