added "Watchtower Client Commands" part to release-notes-0.19.0.md

Author: gap-editor

docs/release-notes/release-notes-0.19.0.md

@@ -395,6 +395,13 @@ The underlying functionality between those two options remain the same.
   `bitcoind 29.0`](https://github.com/lightningnetwork/lnd/pull/9628) to ensure
   compatibility.
 
+* [Watchtower Client Commands](https://github.com/lightningnetwork/lnd/pull/9765): 
+Enhanced documentation for the `session` and `terminate` commands in `lncli wtclient`.  
+The `session` command now includes a comprehensive explanation of its role in managing watchtower client sessions.  
+The `terminate` command offers clear instructions for ending an active session using its unique session ID.
+
+Want it more technical or more casual?
+
 ## Breaking Changes
 ## Performance Improvements