Docs: Correct `@return` value type for `wp_nav_menu()`.

Props chesio.
Fixes #39890.
Built from https://develop.svn.wordpress.org/trunk@40062


git-svn-id: http://core.svn.wordpress.org/trunk@39999 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/nav-menu-template.php

@@ -43,7 +43,7 @@ require_once ABSPATH . WPINC . '/class-walker-nav-menu.php';
  *                                               Uses printf() format with numbered placeholders.
  *     @type string             $item_spacing    Whether to preserve whitespace within the menu's HTML. Accepts 'preserve' or 'discard'. Default 'preserve'.
  * }
- * @return object|false|void Menu output if $echo is false, false if there are no items or no menu was found.
+ * @return string|false|void Menu output if $echo is false, false if there are no items or no menu was found.
  */
 function wp_nav_menu( $args = array() ) {
 	static $menu_id_slugs = array();

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-40061';
+$wp_version = '4.8-alpha-40062';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.