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

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

Props hAmpzter, marekdedic, SergeyBiryukov.
Fixes #48343.

git-svn-id: https://develop.svn.wordpress.org/trunk@47364 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-customize-control.php

@@ -184,6 +184,8 @@ class WP_Customize_Control {
 	 *                                                 be used.
 	 *     @type string               $setting         The primary setting for the control (if there is one).
 	 *                                                 Default 'default'.
+	 *     @type string               $capability      Capability required to use this control. Normally this is empty
+	 *                                                 and the capability is derived from `$settings`.
 	 *     @type int                  $priority        Order priority to load the control. Default 10.
 	 *     @type string               $section         Section the control belongs to. Default empty.
 	 *     @type string               $label           Label for the control. Default empty.
@@ -195,11 +197,14 @@ class WP_Customize_Control {
 	 *                                                 attribute names are the keys and values are the values. Not
 	 *                                                 used for 'checkbox', 'radio', 'select', 'textarea', or
 	 *                                                 'dropdown-pages' control types. Default empty array.
+	 *     @type bool                 $allow_addition  Show UI for adding new content, currently only used for the
+	 *                                                 dropdown-pages control. Default false.
 	 *     @type array                $json            Deprecated. Use WP_Customize_Control::json() instead.
 	 *     @type string               $type            Control type. Core controls include 'text', 'checkbox',
 	 *                                                 'textarea', 'radio', 'select', and 'dropdown-pages'. Additional
 	 *                                                 input types such as 'email', 'url', 'number', 'hidden', and
 	 *                                                 'date' are supported implicitly. Default 'text'.
+	 *     @type callback             $active_callback Active callback.
 	 * }
 	 */
 	public function __construct( $manager, $id, $args = array() ) {