Checkboxlist documentation fix

"Item" parameter keys are the values of the checkbox list,
while the values are the checkbox labels.

framework/yii/helpers/BaseHtml.php

@@ -727,7 +727,7 @@ class BaseHtml
 	 * @param string $name the name attribute of each checkbox.
 	 * @param string|array $selection the selected value(s).
 	 * @param array $items the data item used to generate the checkboxes.
-	 * The array keys are the labels, while the array values are the corresponding checkbox values.
+	 * The array values are the labels, while the array keys are the corresponding checkbox values.
 	 * @param array $options options (name => config) for the checkbox list container tag.
 	 * The following options are specially handled:
 	 *
@@ -1253,7 +1253,7 @@ class BaseHtml
 	 * @param string $attribute the attribute name or expression. See [[getAttributeName()]] for the format
 	 * about attribute expression.
 	 * @param array $items the data item used to generate the checkboxes.
-	 * The array keys are the labels, while the array values are the corresponding checkbox values.
+	 * The array values are the labels, while the array keys are the corresponding checkbox values.
 	 * Note that the labels will NOT be HTML-encoded, while the values will.
 	 * @param array $options options (name => config) for the checkbox list. The following options are specially handled:
 	 *

framework/yii/widgets/ActiveField.php

@@ -503,7 +503,7 @@ class ActiveField extends Component
 	 * As a result, the corresponding submitted value is an array.
 	 * The selection of the checkbox list is taken from the value of the model attribute.
 	 * @param array $items the data item used to generate the checkboxes.
-	 * The array keys are the labels, while the array values are the corresponding checkbox values.
+	 * The array values are the labels, while the array keys are the corresponding checkbox values.
 	 * Note that the labels will NOT be HTML-encoded, while the values will.
 	 * @param array $options options (name => config) for the checkbox list. The following options are specially handled:
 	 *