Add Person's external identifiers to creation and edit form

src/Bundle/ChillPersonBundle/Config/ConfigPersonAltNamesHelper.php

@@ -28,6 +28,8 @@ class ConfigPersonAltNamesHelper
 
     /**
      * get the choices as key => values.
+     *
+     * @return array<string, array<string, string>> where the key is the altName's key, and the value is an array of TranslatableString
      */
     public function getChoices(): array
     {