Docs: Add a `@global` entry for `$wpdb` in `display_setup_form()`.

Props mitraval192.
Fixes #41300.
Built from https://develop.svn.wordpress.org/trunk@41030


git-svn-id: http://core.svn.wordpress.org/trunk@40880 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/install.php

@@ -87,6 +87,8 @@ function display_header( $body_classes = '' ) {
  *
  * @since 2.8.0
  *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
  * @param string|null $error
  */
 function display_setup_form( $error = null ) {

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-41029';
+$wp_version = '4.9-alpha-41030';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.