Add a missing DocBlock for the core utility function _get_cron_lock().

Props mordauk, valendesigns.
Fixes #31646.


git-svn-id: https://develop.svn.wordpress.org/trunk@31804 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-cron.php

@@ -26,7 +26,16 @@ if ( !defined('ABSPATH') ) {
 	require_once( dirname( __FILE__ ) . '/wp-load.php' );
 }
 
-// Uncached doing_cron transient fetch
+/**
+ * Retrieves the cron lock.
+ *
+ * Returns the uncached `doing_cron` transient.
+ *
+ * @ignore
+ * @since 3.3.0
+ *
+ * @return string|false Value of the `doing_cron` transient, 0|false otherwise.
+ */
 function _get_cron_lock() {
 	global $wpdb;