docs: add release notes

Author: guggero

docs/release-notes/release-notes-0.18.4.md

@@ -38,6 +38,7 @@ types in a series of changes:
   * https://github.com/lightningnetwork/lnd/pull/9095
   * https://github.com/lightningnetwork/lnd/pull/8960
   * https://github.com/lightningnetwork/lnd/pull/9194
+  * https://github.com/lightningnetwork/lnd/pull/9288
 
 ## Functional Enhancements