docs: update existing release notes

Author: ellemouton

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

@@ -243,8 +243,11 @@ The underlying functionality between those two options remain the same.
 * [Golang was updated to
   `v1.22.11`](https://github.com/lightningnetwork/lnd/pull/9462). 
 
-* Various refactors to simplify the 
-  `graph.Builder` [1](https://github.com/lightningnetwork/lnd/pull/9476).
+* Various refactors and preparations to simplify the 
+  `graph.Builder` and to move the funding tx validation to the gossiper.
+   [1](https://github.com/lightningnetwork/lnd/pull/9476)
+   [2](https://github.com/lightningnetwork/lnd/pull/9477)
+
 
 ## Breaking Changes
 ## Performance Improvements