Docs: Miscellaneous inline documentation improvements, including:

* Document the post statuses global as an array of `stdClass` objects
* Document the taxonomies global as an array of `WP_Taxonomy` objects
* Document the return value of the post count functions as `stdClass` objects
* Fix some typos

See #53399


git-svn-id: https://develop.svn.wordpress.org/trunk@51885 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-customize-nav-menus.php

@@ -1334,7 +1334,7 @@ final class WP_Customize_Nav_Menus {
 	 *
 	 * @since 4.7.0
 	 *
-	 * @global array $wp_post_statuses List of post statuses.
+	 * @global stdClass[] $wp_post_statuses List of post statuses.
 	 */
 	public function make_auto_draft_status_previewable() {
 		global $wp_post_statuses;