Update error code documentation (#13412)

content/en/docs/17.0/reference/errors/query-serving.md

@@ -60,6 +60,7 @@ These error messages are internal to Vitess. If you are getting other errors fro
 | VT09012 | This type of statement is not allowed on the given tablet. | %s statement with %s tablet not allowed | 0 |  |
 | VT09013 | Durability policy wants Vitess to use semi-sync, but the MySQL instances don't have the semi-sync plugin loaded. | semi-sync plugins are not loaded | 0 |  |
 | VT09014 | The vindex cannot be used as table in DML statement | vindex cannot be modified | 0 |  |
+| VT09015 | This query cannot be planned without more information on the SQL schema. Please turn on schema tracking or add authoritative columns information to your VSchema. | schema tracking required | 0 |  |
 | VT10001 | Foreign key constraints are not allowed, see https://vitess.io/blog/2021-06-15-online-ddl-why-no-fk/. | foreign key constraints are not allowed | 0 |  |
 | VT12001 | This statement is unsupported by Vitess. Please rewrite your query to use supported syntax. | unsupported: %s | 0 |  |
 | VT13001 | This error should not happen and is a bug. Please file an issue on GitHub: https://github.com/vitessio/vitess/issues/new/choose. | [BUG] %s | 0 |  |