rds: update outdated comment

The function rds_send_reset() was subsumed by rds_send_path_reset()
by commit d769ef81d5 ("RDS: Update rds_conn_shutdown to work with
rds_conn_path").  Update the comment accordingly.

Signed-off-by: kexinsun <kexinsun@smail.nju.edu.cn>
Link: https://patch.msgid.link/20260224020720.1174-1-kexinsun@smail.nju.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/rds/send.c

@@ -284,7 +284,7 @@ restart:
 		 *
 		 * cp_xmit_rm holds a ref while we're sending this message down
 		 * the connection.  We can use this ref while holding the
-		 * send_sem.. rds_send_reset() is serialized with it.
+		 * send_sem.. rds_send_path_reset() is serialized with it.
 		 */
 		if (!rm) {
 			unsigned int len;