docs: add release-notes

Author: ziggie1984

docs/release-notes/release-notes-0.19.2.md

@@ -29,6 +29,10 @@
 - [Fixed](https://github.com/lightningnetwork/lnd/pull/9962) a case where the
   node may panic if it's running in the remote signer mode.
 
+- [Fixed](https://github.com/lightningnetwork/lnd/pull/9978) a deadlock which
+  can happen when the peer start-up has not yet completed but a another p2p
+  connection attempt tries to disconnect the peer.
+
 # New Features
 
 ## Functional Enhancements