Fix a documention issue in circuitlist.c

/** Implementation helper for circuit_set_{p,n}_circid_orconn: A circuit ID

 * and/or or_connection for circ has just changed from <b>old_conn, old_id</b>

 * to <b>conn, id</b>.  Adjust the conn,circid map as appropriate, removing

 * the old entry (if any) and adding a new one.  If <b>active</b> is true,

 * remove the circuit from the list of active circuits on old_conn and add it

 * to the list of active circuits on conn.

 * XXX "active" isn't an arg anymore */

 * the old entry (if any) and adding a new one. */

static void

circuit_set_circid_orconn_helper(circuit_t *circ, int direction,

                                 circid_t id,