docs: release-notes-0.22.0

Author: MPins

docs/release-notes/release-notes-0.22.0.md

@@ -52,6 +52,9 @@
 
 ## BOLT Spec Updates
 
+* LND now [enforces](https://github.com/lightning/bolts/pull/1284) low-S
+  canonical signatures when `n` field is present in a BOLT11 invoice.
+
 * The fundee now [enforces the BOLT-02 bound on
   `push_msat`](https://github.com/lightningnetwork/lnd/pull/10765),
   rejecting incoming `open_channel` messages where `push_msat` exceeds