docs: add release-notes

Author: ziggie1984

Diff for: docs/release-notes/release-notes-0.19.0.md

@@ -85,6 +85,11 @@
 * [Fixed a bug](https://github.com/lightningnetwork/lnd/pull/9595) where the
   initial graph sync query may be failed due to inconsistent state.
 
+* [Fixed a bug](https://github.com/lightningnetwork/lnd/pull/9543) where
+  the payment might have been failed more than once and therefore overwriting
+  the failure reason and notifying the `SubscribeAllPayments` subscribers more
+  than once.
+
 # New Features
 
 * [Support](https://github.com/lightningnetwork/lnd/pull/8390) for