Merge pull request #7439 from ellemouton/bolt3-test-vectors

lnwallet: update Bolt3 test vectors

docs/release-notes/release-notes-0.16.1.md

@@ -14,6 +14,11 @@
 
 * [Return `FEE_INSUFFICIENT` before checking balance for incoming low-fee
   HTLCs.](https://github.com/lightningnetwork/lnd/pull/7490).
+ 
+## Spec
+
+* [Add test vectors for
+  option_zero_fee_htlc_tx](https://github.com/lightningnetwork/lnd/pull/7439)
 
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