Docs: Add a `@global` entry for `$wp_filter` in `wp_start_object_cache()`.

Props bhaveshkhadodara.
Fixes #41222.
Built from https://develop.svn.wordpress.org/trunk@40992


git-svn-id: http://core.svn.wordpress.org/trunk@40842 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/load.php

@@ -470,6 +470,8 @@ function wp_using_ext_object_cache( $using = null ) {
  *
  * @since 3.0.0
  * @access private
+ *
+ * @global array $wp_filter Stores all of the filters.
  */
 function wp_start_object_cache() {
 	global $wp_filter;

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-40991';
+$wp_version = '4.9-alpha-40992';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.