Index: wp-includes/query.php
===================================================================
--- wp-includes/query.php	(revision 48147)
+++ wp-includes/query.php	(working copy)
@@ -901,7 +901,7 @@
 			'<code>pre_get_posts</code>',
 			'<code>WP_Query->is_main_query()</code>',
 			'<code>is_main_query()</code>',
-			__( 'https://codex.wordpress.org/Function_Reference/is_main_query' )
+			__( 'https://developer.wordpress.org/reference/functions/is_main_query/' )
 		);
 		_doing_it_wrong( __FUNCTION__, $message, '3.7.0' );
 	}