docs: update release note for channel_ready

docs/release-notes/release-notes-0.16.1.md

@@ -26,6 +26,13 @@
   added to `lnrpc` so the node operator can know whether a certain request has
   happened or not.
 
+* Message `funding_locked` [has been
+  renamed](https://github.com/lightningnetwork/lnd/pull/7517) to
+  `channel_ready` internally to match the specs update. This should not change
+  anything for the users since the message type(36) stays unchanged, except in
+  the logging all the appearance of `funding_locked` replated experssion is
+  replaced with `channel_ready`.
+
 # Contributors (Alphabetical Order)
 
 * Elle Mouton