bolt4: fix ordering of accepting and forwarding contents

Author: carlaKC

04-onion-routing.md

@@ -52,8 +52,8 @@ A node:
     * [Basic Multi-Part Payments](#basic-multi-part-payments)
     * [Route Blinding](#route-blinding)
   * [Accepting and Forwarding a Payment](#accepting-and-forwarding-a-payment)
-    * [Payload for the Last Node](#payload-for-the-last-node)
     * [Non-strict Forwarding](#non-strict-forwarding)
+    * [Payload for the Last Node](#payload-for-the-last-node)
   * [Shared Secret](#shared-secret)
   * [Blinding Ephemeral Keys](#blinding-ephemeral-keys)
   * [Packet Construction](#packet-construction)