Fill in the @param types for the args for make_site_theme_from_default().

See #30224.


git-svn-id: https://develop.svn.wordpress.org/trunk@30195 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/upgrade.php

@@ -1973,9 +1973,9 @@ function make_site_theme_from_oldschool($theme_name, $template) {
  *
  * @since 1.5.0
  *
- * @param unknown_type $theme_name
- * @param unknown_type $template
- * @return unknown
+ * @param string $theme_name
+ * @param string $template
+ * @return bool|null
  */
 function make_site_theme_from_default($theme_name, $template) {
 	$site_dir = WP_CONTENT_DIR . "/themes/$template";