docs: update release notes

Author: ellemouton

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

@@ -67,6 +67,9 @@
   protocol](https://github.com/lightningnetwork/lnd/pull/8255) to be able to
   gossip new Gossip 1.75 messages.
 
+* Add the new [feature bit](https://github.com/lightningnetwork/lnd/pull/8256)
+  for Gossip 1.75 and allow creation of public channels from lncli.
+
 ## Testing
 ## Database