Docs: Correct @return value for update_core() and Core_Upgrader::upgrade().

See #48303.
Built from https://develop.svn.wordpress.org/trunk@47099


git-svn-id: http://core.svn.wordpress.org/trunk@46899 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-core-upgrader.php

@@ -57,7 +57,7 @@ class Core_Upgrader extends WP_Upgrader {
 	 *        @type bool $do_rollback      Whether to perform this "upgrade" as a rollback.
 	 *                                     Default false.
 	 * }
-	 * @return null|false|WP_Error Null on success, false or WP_Error on failure.
+	 * @return string|false|WP_Error New WordPress version on success, false or WP_Error on failure.
 	 */
 	public function upgrade( $current, $args = array() ) {
 		global $wp_filesystem;

wp-admin/includes/update-core.php

@@ -880,7 +880,7 @@ $_new_bundled_files = array(
  *
  * @param string $from New release unzipped path.
  * @param string $to   Path to old WordPress installation.
- * @return null|WP_Error Null on success, WP_Error on failure.
+ * @return string|WP_Error New WordPress version on success, WP_Error on failure.
  */
 function update_core( $from, $to ) {
 	global $wp_filesystem, $_old_files, $_new_bundled_files, $wpdb;

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-47098';
+$wp_version = '5.4-alpha-47099';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.