Docs: Include 'weekly' as a valid value in wp_schedule_event() de…

…scription.

Follow-up to [47062].

Props crstauf, pacicio.
Fixes #59888.

git-svn-id: https://develop.svn.wordpress.org/trunk@57106 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/cron.php

@@ -206,8 +206,8 @@ function wp_schedule_single_event( $timestamp, $hook, $args = array(), $wp_error
  * The action will trigger when someone visits your WordPress site if the scheduled
  * time has passed.
  *
- * Valid values for the recurrence are 'hourly', 'daily', and 'twicedaily'. These can
- * be extended using the {@see 'cron_schedules'} filter in wp_get_schedules().
+ * Valid values for the recurrence are 'hourly', 'twicedaily', 'daily', and 'weekly'.
+ * These can be extended using the {@see 'cron_schedules'} filter in wp_get_schedules().
  *
  * Use wp_next_scheduled() to prevent duplicate events.
  *