Docs: Correct description for `insert_user_meta` filter.

Props milana_cap, desrosj.
Fixes #41951.

git-svn-id: https://develop.svn.wordpress.org/trunk@41564 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/user.php

@@ -1699,7 +1699,8 @@ function wp_insert_user( $userdata ) {
 	$user = new WP_User( $user_id );
 
 	/**
- 	 * Filters a user's meta values and keys before the user is created or updated.
+ 	 * Filters a user's meta values and keys immediately after the user is created or updated
+ 	 * and before any user meta is inserted or updated.
  	 *
  	 * Does not include contact methods. These are added using `wp_get_user_contact_methods( $user )`.
  	 *