Docs: Add a reference to WP_Customize_Setting::__construct() for information on accepted arguments in WP_Customize_Manager::add_setting().

Synchronize the documentation between two places, use `WP_Customize_Setting::__construct()` as the canonical source.

Props tmanoilov, marekdedic.
Fixes #48347.
Built from https://develop.svn.wordpress.org/trunk@47384


git-svn-id: http://core.svn.wordpress.org/trunk@47171 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-customize-setting.php

@@ -156,7 +156,23 @@ class WP_Customize_Setting {
 	 * @param WP_Customize_Manager $manager Customizer bootstrap instance.
 	 * @param string               $id      A specific ID of the setting.
 	 *                                      Can be a theme mod or option name.
-	 * @param array                $args    Setting arguments.
+	 * @param array                $args    {
+	 *  Optional. Array of properties for the new Setting object. Default empty array.
+	 *
+	 *  @type string       $type                  Type of the setting. Default 'theme_mod'.
+	 *  @type string       $capability            Capability required for the setting. Default 'edit_theme_options'
+	 *  @type string|array $theme_supports        Theme features required to support the panel. Default is none.
+	 *  @type string       $default               Default value for the setting. Default is empty string.
+	 *  @type string       $transport             Options for rendering the live preview of changes in Customizer.
+	 *                                            Using 'refresh' makes the change visible by reloading the whole preview.
+	 *                                            Using 'postMessage' allows a custom JavaScript to handle live changes.
+	 *                                            Default is 'refresh'.
+	 *  @type callable     $validate_callback     Server-side validation callback for the setting's value.
+	 *  @type callable     $sanitize_callback     Callback to filter a Customize setting value in un-slashed form.
+	 *  @type callable     $sanitize_js_callback  Callback to convert a Customize PHP setting value to a value that is
+	 *                                            JSON serializable.
+	 *  @type bool         $dirty                 Whether or not the setting is initially dirty when created.
+	 * }
 	 */
 	public function __construct( $manager, $id, $args = array() ) {
 		$keys = array_keys( get_object_vars( $this ) );