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

Props ajayghaghretiya1.
Fixes #41308.
Built from https://develop.svn.wordpress.org/trunk@41039


git-svn-id: http://core.svn.wordpress.org/trunk@40889 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/user.php

@@ -694,6 +694,8 @@ function get_blogs_of_user( $user_id, $all = false ) {
  *
  * @since MU 1.1
  *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
  * @param int $user_id Optional. The unique ID of the user. Defaults to the current user.
  * @param int $blog_id Optional. ID of the blog to check. Defaults to the current site.
  * @return bool

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-41037';
+$wp_version = '4.9-alpha-41039';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.