With 23c the existing values_clause used in the insert statement was renamed to insert_values_clause. The new values_clause is part of the table value constructor introduced in 23c.
See for 23c: https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/INSERT.html#GUID-903F8043-0254-4EE9-ACC1-CB8AC0AF3423__GUID-189C3414-46E8-4EF2-8E10-03483DD68F6E
See for 21c: https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/INSERT.html#GUID-903F8043-0254-4EE9-ACC1-CB8AC0AF3423__GUID-189C3414-46E8-4EF2-8E10-03483DD68F6E
The railroad diagrams still reference the values_clause. However, the link below the figures correctly reference the new insert_values_clause.