Docs: Add a `@global` entry for `$wpdb` in `_get_cron_lock`.

Props tejas5989.
Fixes #41433.
Built from https://develop.svn.wordpress.org/trunk@41146


git-svn-id: http://core.svn.wordpress.org/trunk@40986 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-cron.php

@@ -34,6 +34,8 @@ if ( !defined('ABSPATH') ) {
  * @ignore
  * @since 3.3.0
  *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
  * @return string|false Value of the `doing_cron` transient, 0|false otherwise.
  */
 function _get_cron_lock() {

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-41145';
+$wp_version = '4.9-alpha-41146';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.