improved phpdoc of ActiveForm

framework/widgets/ActiveForm.php

@@ -260,7 +260,8 @@ class ActiveForm extends Widget
      * @param Model $model the data model
      * @param string $attribute the attribute name or expression. See [[Html::getAttributeName()]] for the format
      * about attribute expression.
-     * @param array $options the additional configurations for the field object
+     * @param array $options the additional configurations for the field object. These are properties of [[ActiveField]]
+     * or a subclass, depending on the value of [[fieldClass]].
      * @return ActiveField the created ActiveField object
      * @see fieldConfig
      */